HEATING & COOLING DEGREE DAYS What next? If you are new to energy data analysis and haven't heard of Degree Days.net before, you might like to find out why so many energy professionals get data from us and why our API is a key component of numerous energy-management software systems worldwide. You could also take a look at some quotes from a few of our many happy users.. We have several articles on degree days and how to CALCULATING DEGREE DAYSDEGREE DAYS.NET TOOLABOUT Calculating Degree Days. This page explains how Degree Days.net calculates degree days. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail – just use Degree Days.net to calculate the degree days for you. But you might find our answers to these calculation-related questions useful if you're curious, or deciding

DEGREE DAYS

Heating degree days in 2018: 4,092. Applying some simple arithmetic: kWh per degree day in 2017 = 452,976 / 3,320 = 136. kWh per degree day in 2018 = 445,241 / 4,083 = 109. Comparing these two figures, Dan concluded that the heating energy efficiency in 2018 was around 20% better than that in 2017. ABOUT DEGREE DAYS.NET About Degree Days.net. Degree Days.net is an online software tool that calculates degree days using temperature data from thousands of weather stations worldwide. We at BizEE Software created Degree Days.net to help energy-saving professionals use degree days more

effectively.

BASE TEMPERATURE (OR BALANCE POINT) FOR HEATING & COOLINGSEE MORE ON

DEGREEDAYS.NET

DEGREE DAYS API

Degree Days.net API for Automated Access to HDD and CDD. The Degree Days.net API (Application Programming Interface) makes it easy to automate the process of fetching data from our system. Using our API, your software can: Fetch custom-specified degree-day data from locations worldwide, as and when it's needed. REGRESSION ANALYSIS OF ENERGY CONSUMPTION AND DEGREE DAYSSEE MORE ON

DEGREEDAYS.NET

HOW TO CALCULATE ENERGY SAVINGS USING DEGREE DAYS AND E = 220.624*HDD + 1954.298*days E = 220.624*2678 + 1954.298*365 E = 1,304,150. Note that the units of the calculated energy usage E will be the same as the units of the energy-usage data that was used to make the baseline regression – it could be kWh, or therms, or

whatever.

THE KILOWATT / "KILL-A-WATT" METER The Kill-A-Watt P4400 Meter – this is the basic model that lets you read the instantaneous Watts, Volts, Current, Frequency, Power Factor, and VA, and keeps a running total of kWh (energy consumption) and the total time since the power was switched on.; The Kill-A-Watt EZ P4460 Meter – this enhanced model does all the above, but also lets you program in the price you pay for electricity so INFRARED LASER THERMOMETER They all have laser targeting, good temperature ranges, a choice of Celsius and Fahrenheit, comparable levels of accuracy, and lots of great user reviews on Amazon. Kintrex IRT0421 Non-Contact Infrared Thermometer with Laser Targeting – a temperature range of −60C to 500C, or −76F to 932F, and a 12:1 distance-to-spot ratio. HEATING & COOLING DEGREE DAYS What next? If you are new to energy data analysis and haven't heard of Degree Days.net before, you might like to find out why so many energy professionals get data from us and why our API is a key component of numerous energy-management software systems worldwide. You could also take a look at some quotes from a few of our many happy users.. We have several articles on degree days and how to CALCULATING DEGREE DAYSDEGREE DAYS.NET TOOLABOUT Calculating Degree Days. This page explains how Degree Days.net calculates degree days. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail – just use Degree Days.net to calculate the degree days for you. But you might find our answers to these calculation-related questions useful if you're curious, or deciding

DEGREE DAYS

Heating degree days in 2018: 4,092. Applying some simple arithmetic: kWh per degree day in 2017 = 452,976 / 3,320 = 136. kWh per degree day in 2018 = 445,241 / 4,083 = 109. Comparing these two figures, Dan concluded that the heating energy efficiency in 2018 was around 20% better than that in 2017. ABOUT DEGREE DAYS.NET About Degree Days.net. Degree Days.net is an online software tool that calculates degree days using temperature data from thousands of weather stations worldwide. We at BizEE Software created Degree Days.net to help energy-saving professionals use degree days more

effectively.

BASE TEMPERATURE (OR BALANCE POINT) FOR HEATING & COOLINGSEE MORE ON

DEGREEDAYS.NET

DEGREE DAYS API

Degree Days.net API for Automated Access to HDD and CDD. The Degree Days.net API (Application Programming Interface) makes it easy to automate the process of fetching data from our system. Using our API, your software can: Fetch custom-specified degree-day data from locations worldwide, as and when it's needed. REGRESSION ANALYSIS OF ENERGY CONSUMPTION AND DEGREE DAYSSEE MORE ON

DEGREEDAYS.NET

HOW TO CALCULATE ENERGY SAVINGS USING DEGREE DAYS AND E = 220.624*HDD + 1954.298*days E = 220.624*2678 + 1954.298*365 E = 1,304,150. Note that the units of the calculated energy usage E will be the same as the units of the energy-usage data that was used to make the baseline regression – it could be kWh, or therms, or

whatever.

THE KILOWATT / "KILL-A-WATT" METER The Kill-A-Watt P4400 Meter – this is the basic model that lets you read the instantaneous Watts, Volts, Current, Frequency, Power Factor, and VA, and keeps a running total of kWh (energy consumption) and the total time since the power was switched on.; The Kill-A-Watt EZ P4460 Meter – this enhanced model does all the above, but also lets you program in the price you pay for electricity so INFRARED LASER THERMOMETER They all have laser targeting, good temperature ranges, a choice of Celsius and Fahrenheit, comparable levels of accuracy, and lots of great user reviews on Amazon. Kintrex IRT0421 Non-Contact Infrared Thermometer with Laser Targeting – a temperature range of −60C to 500C, or −76F to 932F, and a 12:1 distance-to-spot ratio. ARTICLES ABOUT DEGREE DAYS AND HOW BEST TO USE THEM Articles About Degree Days and How Best to Use Them. Degree days are central to analysis of heating and cooling energy consumption, but it takes knowledge and experience to use them effectively. The articles listed here should help you understand what degree days are and how best to use them. Experience then comes from using the techniques DEGREE DAYS.NET PRO WEBSITE Degree Days.net Pro – The Website You Know and Love, Enhanced for Full Professional Use. Degree Days.net exists to help people monitor, manage, and reduce building energy consumption. The free website is designed to be enough for basic needs, providing up to 36 months' worth of recent data history, 5-year averages, and a regression tool

that

DEGREE DAYS.NET DESKTOP Laura Troise, HEI Hotels & Resorts, ENERGY STAR® Partner of the Year. Our desktop app makes it quick and easy to download data for lots of locations at once: Specify a list of locations and the data you want for each. Let our system generate and assemble the data for you automatically. Export it DEGREE DAYS.NET BREAKDOWN OPTIONS Degree Days.net Breakdown Options. Degree days start out as daily data, and then are combined (usually summed) to make different breakdowns. Degree Days.net offers a range of commonly-used breakdowns:. Daily – one figure per day.; Weekly – one figure per week. Each weekly figure is the sum of the 7 daily figures within the

week.

DEGREE DAYS API .NET CLIENT LIBRARY FOR C#, VB.NET ETC. .NET Client Library for Degree Days.net API. The .NET client library is stable, well tested, and well documented. It is the recommended way

to access the API

DEGREE DAYS.NET BASELINE REGRESSION TOOL Degree Days.net Baseline Regression Tool. Regression is at the core of most analysis of heating/cooling energy consumption. A baseline regression describes energy consumption over a chosen baseline period, and is typically used to compare later energy consumption against baseline levels (e.g. to track ongoing performance or prove savings from changes made after the baseline period). ENERGY DEGREE PROGRAMS AND COURSES Energy Degree Programs and Courses. The sorts of people that use our degree days calculator are often interested in studying energy-related disciplines further. As awareness of energy and environmental issues increases, more and more institutions are offering energy-related

degree courses.

WHY 5000+ ENERGY PROFESSIONALS GET DATA FROM US EACH MONTH Well, yes it does! We don't like to brag, but we feel it's important for newcomers to energy-data analysis to understand that there are compelling reasons why 5000+ energy professionals regularly download data from Degree Days.net, and why our API is used by numerous WEATHER NORMALIZATION OF US ELECTRICITY CONSUMPTION USING 2014 regression equation US electricity consumption = (182.00741 × HDD) + (396.05980 × CDD) + (8632.88222 × days) Where: days is the number of days covered by the period you have HDD and CDD for US electricity consumption is the total usage predicted over the period, in millions of kWh HDD is the population-weighted heating degree days with base temperature 55°F over the period CDD is the HEATING & COOLING DEGREE DAYS 1 8491079-73.938500000000005 40.664299999999997. 2 3928864-118.41079999999999 34.019399999999997. 3 2722389-87.681799999999996 41.837600000000002. 4 2239558 HEATING & COOLING DEGREE DAYS What next? If you are new to energy data analysis and haven't heard of Degree Days.net before, you might like to find out why so many energy professionals get data from us and why our API is a key component of numerous energy-management software systems worldwide. You could also take a look at some quotes from a few of our many happy users.. We have several articles on degree days and how to CALCULATING DEGREE DAYSDEGREE DAYS.NET TOOLABOUT Calculating Degree Days. This page explains how Degree Days.net calculates degree days. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail – just use Degree Days.net to calculate the degree days for you. But you might find our answers to these calculation-related questions useful if you're curious, or deciding

DEGREE DAYS

(The 2 degrees is because 15°C is 2 degrees below the base temperature of 17°C, and the 0.5 days are because 00:00 to 12:00 is half a day. We calculate the heating degree days for each period in the day, and then add them together to get the total for that day:

1.5.)

ABOUT DEGREE DAYS.NET About Degree Days.net. Degree Days.net is an online software tool that calculates degree days using temperature data from thousands of weather stations worldwide. BASE TEMPERATURE (OR BALANCE POINT) FOR HEATING & COOLINGSEE MORE ON

DEGREEDAYS.NET

REGRESSION ANALYSIS OF ENERGY CONSUMPTION AND DEGREE DAYSSEE MORE ON

DEGREEDAYS.NET

WHY 5000+ ENERGY PROFESSIONALS GET DATA FROM US EACH MONTH Why Get Your Degree Days from Us? Degree days are degree days, right? Does it really matter where you get them from? Well, yes it does! We don't like to brag, but we HOW TO CALCULATE ENERGY SAVINGS USING DEGREE DAYS AND Regression coefficients? The a, b, and c in the regression equations above are called "regression coefficients". In a real regression equation (calculated using real energy data and real degree days) these regression coefficients would be real numbers (like 12.563, 539.1, or 4,092.271).. Regression coefficients are calculated as part of the regression process, but you don't need to understand CAPE COD TEST ACCESS KEYS FOR DEVELOPERS Cape Cod Test Access Keys for Developers. Here are some API access keys that you can use for development and testing: Account key:

test-test-test

WEATHER NORMALIZATION OF US ELECTRICITY CONSUMPTION USINGSEE MORE ON

DEGREEDAYS.NET

HEATING & COOLING DEGREE DAYS What next? If you are new to energy data analysis and haven't heard of Degree Days.net before, you might like to find out why so many energy professionals get data from us and why our API is a key component of numerous energy-management software systems worldwide. You could also take a look at some quotes from a few of our many happy users.. We have several articles on degree days and how to CALCULATING DEGREE DAYSDEGREE DAYS.NET TOOLABOUT Calculating Degree Days. This page explains how Degree Days.net calculates degree days. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail – just use Degree Days.net to calculate the degree days for you. But you might find our answers to these calculation-related questions useful if you're curious, or deciding

DEGREE DAYS

(The 2 degrees is because 15°C is 2 degrees below the base temperature of 17°C, and the 0.5 days are because 00:00 to 12:00 is half a day. We calculate the heating degree days for each period in the day, and then add them together to get the total for that day:

1.5.)

ABOUT DEGREE DAYS.NET About Degree Days.net. Degree Days.net is an online software tool that calculates degree days using temperature data from thousands of weather stations worldwide. BASE TEMPERATURE (OR BALANCE POINT) FOR HEATING & COOLINGSEE MORE ON

DEGREEDAYS.NET

REGRESSION ANALYSIS OF ENERGY CONSUMPTION AND DEGREE DAYSSEE MORE ON

DEGREEDAYS.NET

WHY 5000+ ENERGY PROFESSIONALS GET DATA FROM US EACH MONTH Why Get Your Degree Days from Us? Degree days are degree days, right? Does it really matter where you get them from? Well, yes it does! We don't like to brag, but we HOW TO CALCULATE ENERGY SAVINGS USING DEGREE DAYS AND Regression coefficients? The a, b, and c in the regression equations above are called "regression coefficients". In a real regression equation (calculated using real energy data and real degree days) these regression coefficients would be real numbers (like 12.563, 539.1, or 4,092.271).. Regression coefficients are calculated as part of the regression process, but you don't need to understand CAPE COD TEST ACCESS KEYS FOR DEVELOPERS Cape Cod Test Access Keys for Developers. Here are some API access keys that you can use for development and testing: Account key:

test-test-test

WEATHER NORMALIZATION OF US ELECTRICITY CONSUMPTION USINGSEE MORE ON

DEGREEDAYS.NET

ARTICLES ABOUT DEGREE DAYS AND HOW BEST TO USE THEM Articles About Degree Days and How Best to Use Them. Degree days are central to analysis of heating and cooling energy consumption, but it takes knowledge and experience to use them effectively.

DEGREE DAYS API

All the data-generation options available through our website, and more: thousands of weather stations; daily, weekly, monthly, yearly, custom, and average data breakdowns; extended historical data (no 36-month limit); even more base temperatures to choose from; and hourly temperature data too.The API also uses the same accurate calculation processes as the website, but with intensive ENERGY DEGREE PROGRAMS AND COURSES Energy Degree Programs and Courses. The sorts of people that use our degree days calculator are often interested in studying energy-related disciplines further. As awareness of energy and environmental issues increases, more and more institutions are offering energy-related

degree courses.

DEGREE DAYS.NET BREAKDOWN OPTIONS Degree Days.net Breakdown Options. Degree days start out as daily data, and then are combined (usually summed) to make different breakdowns. Degree Days.net offers a range of commonly-used breakdowns:. Daily – one figure per day.; Weekly – one figure per week. Each weekly figure is the sum of the 7 daily figures within the

week.

DEGREE DAYS API .NET CLIENT LIBRARY FOR C#, VB.NET ETC. .NET Client Library for Degree Days.net API. The .NET client library is stable, well tested, and well documented. It is the recommended way

to access the API

DEGREE DAYS.NET PRO WEBSITE ACCESS FOR API CUSTOMERS Degree Days.net Pro Website Access for API Customers. API Standard, Plus, and Premium accounts come with free Team access to Degree Days.net Pro (worth $75 a month). For large amounts of data we recommend the API or the desktop app (which itself uses the API), but the Degree Days.net Pro website is great if you or your coworkers use the regression tool or want easy web access to relatively

DEGREE DAYS.NET API

†Degree days. All API plans will let you fetch HDD and CDD from the API (and desktop app), in any base temperature(s) you choose. Extended historical data is available too (back to 2000 for many locations), though you will need more request units for each year of data you

fetch.

DEGREE DAYS.NET

Degree Days.net – Frequently Asked Questions. There are a few questions that we get asked fairly frequently – we've tried our best to answer them clearly below: INFRARED LASER THERMOMETER A Cheap Infrared Laser Thermometer Makes a Great Thermal Leak Detector Infrared laser thermometers are great, affordable gadgets for finding draughts and thermal leaks in buildings. HEATING & COOLING DEGREE DAYS 1 8491079-73.938500000000005 40.664299999999997. 2 3928864-118.41079999999999 34.019399999999997. 3 2722389-87.681799999999996 41.837600000000002. 4 2239558 HEATING & COOLING DEGREE DAYS Degree Days Calculated Accurately for Locations Worldwide. Buildings require more heating in colder weather, and more air-conditioning in hotter weather. Degree Days.net provides the data to quantify this and help monitor, manage, and reduce energy consumption in millions of buildings around the world. It is developed and maintained by BizEE CALCULATING DEGREE DAYSDEGREE DAYS.NET TOOLABOUT Calculating Degree Days. This page explains how Degree Days.net calculates degree days. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail – just use Degree Days.net to calculate the degree days for you. But you might find our answers to these calculation-related questions useful if you're curious, or deciding

DEGREE DAYS

Heating degree days in 2018: 4,092. Applying some simple arithmetic: kWh per degree day in 2017 = 452,976 / 3,320 = 136. kWh per degree day in 2018 = 445,241 / 4,083 = 109. Comparing these two figures, Dan concluded that the heating energy efficiency in 2018 was around 20% better than that in 2017. BASE TEMPERATURE (OR BALANCE POINT) FOR HEATING & COOLINGSEE MORE ON

DEGREEDAYS.NET

REGRESSION ANALYSIS OF ENERGY CONSUMPTION AND DEGREE DAYSSEE MORE ON

DEGREEDAYS.NET

DEGREE DAYS API

Degree Days.net API for Automated Access to HDD and CDD. The Degree Days.net API (Application Programming Interface) makes it easy to automate the process of fetching data from our system. Using our API, your software can: Fetch custom-specified degree-day data from locations worldwide, as and when it's needed. ENERGY DEGREE PROGRAMS AND COURSES Energy Degree Programs and Courses. The sorts of people that use our degree days calculator are often interested in studying energy-related disciplines further. As awareness of energy and environmental issues increases, more and more institutions are offering energy-related

degree courses.

DEGREE DAYS API .NET CLIENT LIBRARY FOR C#, VB.NET ETC.SEE MORE ON

DEGREEDAYS.NET

HOW TO CALCULATE ENERGY SAVINGS USING DEGREE DAYS AND E = 220.624*HDD + 1954.298*days E = 220.624*2678 + 1954.298*365 E = 1,304,150. Note that the units of the calculated energy usage E will be the same as the units of the energy-usage data that was used to make the baseline regression – it could be kWh, or therms, or

whatever.

WEATHER NORMALIZATION OF US ELECTRICITY CONSUMPTION USINGSEE MORE ON DEGREEDAYS.NETWEATHER NORMALIZATION FORMULAWEATHER NORMALIZATION SOFTWAREWEATHER NORMALIZATION CHARGEWEATHER NORMALIZATION ADJUSTMENTWEATHER NORMALIZATION FOR UTILITIESTOTAL US ELECTRICITY

CONSUMPTION

HEATING & COOLING DEGREE DAYS Degree Days Calculated Accurately for Locations Worldwide. Buildings require more heating in colder weather, and more air-conditioning in hotter weather. Degree Days.net provides the data to quantify this and help monitor, manage, and reduce energy consumption in millions of buildings around the world. It is developed and maintained by BizEE CALCULATING DEGREE DAYSDEGREE DAYS.NET TOOLABOUT Calculating Degree Days. This page explains how Degree Days.net calculates degree days. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail – just use Degree Days.net to calculate the degree days for you. But you might find our answers to these calculation-related questions useful if you're curious, or deciding

DEGREE DAYS

Heating degree days in 2018: 4,092. Applying some simple arithmetic: kWh per degree day in 2017 = 452,976 / 3,320 = 136. kWh per degree day in 2018 = 445,241 / 4,083 = 109. Comparing these two figures, Dan concluded that the heating energy efficiency in 2018 was around 20% better than that in 2017. BASE TEMPERATURE (OR BALANCE POINT) FOR HEATING & COOLINGSEE MORE ON

DEGREEDAYS.NET

REGRESSION ANALYSIS OF ENERGY CONSUMPTION AND DEGREE DAYSSEE MORE ON

DEGREEDAYS.NET

DEGREE DAYS API

Degree Days.net API for Automated Access to HDD and CDD. The Degree Days.net API (Application Programming Interface) makes it easy to automate the process of fetching data from our system. Using our API, your software can: Fetch custom-specified degree-day data from locations worldwide, as and when it's needed. ENERGY DEGREE PROGRAMS AND COURSES Energy Degree Programs and Courses. The sorts of people that use our degree days calculator are often interested in studying energy-related disciplines further. As awareness of energy and environmental issues increases, more and more institutions are offering energy-related

degree courses.

DEGREE DAYS API .NET CLIENT LIBRARY FOR C#, VB.NET ETC.SEE MORE ON

DEGREEDAYS.NET

HOW TO CALCULATE ENERGY SAVINGS USING DEGREE DAYS AND E = 220.624*HDD + 1954.298*days E = 220.624*2678 + 1954.298*365 E = 1,304,150. Note that the units of the calculated energy usage E will be the same as the units of the energy-usage data that was used to make the baseline regression – it could be kWh, or therms, or

whatever.

WEATHER NORMALIZATION OF US ELECTRICITY CONSUMPTION USINGSEE MORE ON DEGREEDAYS.NETWEATHER NORMALIZATION FORMULAWEATHER NORMALIZATION SOFTWAREWEATHER NORMALIZATION CHARGEWEATHER NORMALIZATION ADJUSTMENTWEATHER NORMALIZATION FOR UTILITIESTOTAL US ELECTRICITY

CONSUMPTION

DEGREE DAYS.NET DESKTOP Laura Troise, HEI Hotels & Resorts, ENERGY STAR® Partner of the Year. Our desktop app makes it quick and easy to download data for lots of locations at once: Specify a list of locations and the data you want for each. Let our system generate and assemble the data for you automatically. Export it ARTICLES ABOUT DEGREE DAYS AND HOW BEST TO USE THEM Articles About Degree Days and How Best to Use Them. Degree days are central to analysis of heating and cooling energy consumption, but it takes knowledge and experience to use them effectively. The articles listed here should help you understand what degree days are and how best to use them. Experience then comes from using the techniques DEGREE DAYS.NET BREAKDOWN OPTIONS Degree Days.net Breakdown Options. Degree days start out as daily data, and then are combined (usually summed) to make different breakdowns. Degree Days.net offers a range of commonly-used breakdowns:. Daily – one figure per day.; Weekly – one figure per week. Each weekly figure is the sum of the 7 daily figures within the

week.

DEGREE DAYS API .NET CLIENT LIBRARY FOR C#, VB.NET ETC. .NET Client Library for Degree Days.net API. The .NET client library is stable, well tested, and well documented. It is the recommended way

to access the API

DEGREE DAYS.NET BASELINE REGRESSION TOOL Degree Days.net Baseline Regression Tool. Regression is at the core of most analysis of heating/cooling energy consumption. A baseline regression describes energy consumption over a chosen baseline period, and is typically used to compare later energy consumption against baseline levels (e.g. to track ongoing performance or prove savings from changes made after the baseline period).

DEGREE DAYS.NET API

†Degree days. All API plans will let you fetch HDD and CDD from the API (and desktop app), in any base temperature(s) you choose. Extended historical data is available too (back to 2000 for many locations), though you will need more request units for each year of data you

fetch.

DEGREE DAYS.NET PRO WEBSITE ACCESS FOR API CUSTOMERS Degree Days.net Pro Website Access for API Customers. API Standard, Plus, and Premium accounts come with free Team access to Degree Days.net Pro (worth $75 a month). For large amounts of data we recommend the API or the desktop app (which itself uses the API), but the Degree Days.net Pro website is great if you or your coworkers use the regression tool or want easy web access to relatively WEATHER NORMALIZATION OF US ELECTRICITY CONSUMPTION USING 2014 regression equation US electricity consumption = (182.00741 × HDD) + (396.05980 × CDD) + (8632.88222 × days) Where: days is the number of days covered by the period you have HDD and CDD for US electricity consumption is the total usage predicted over the period, in millions of kWh HDD is the population-weighted heating degree days with base temperature 55°F over the period CDD is the CAPE COD TEST ACCESS KEYS FOR DEVELOPERS Cape Cod Test Access Keys for Developers. Here are some API access keys that you can use for development and testing: Account key: test-test-test. Security key: test-test-test-test-test-test-test-test-test-test-test-test-test. You can use this test account with any of our client libraries ( Java, .NET, Python ); with our sample code INFRARED LASER THERMOMETER They all have laser targeting, good temperature ranges, a choice of Celsius and Fahrenheit, comparable levels of accuracy, and lots of great user reviews on Amazon. Kintrex IRT0421 Non-Contact Infrared Thermometer with Laser Targeting – a temperature range of −60C to 500C, or −76F to 932F, and a 12:1 distance-to-spot ratio.

Degree Days

Degree Days

Weather Data for Energy Saving

* Web Tool

* Pro Access

* Desktop App: Assemble Lots of Data, Fast * API: Let Your Software Access Data Automatically

< Back

Why 5000+ Energy Pros Get Data From Us Each Month... DEGREE DAYS CALCULATED ACCURATELY FOR LOCATIONS WORLDWIDE Buildings require more heating in colder weather, and more air-conditioning in hotter weather. Degree Days.net provides the data to quantify this and help monitor, manage, and reduce energy consumption in millions of buildings around the world. It is developed and maintained by BizEE Software . HOURLY TEMPERATURE DATA: _We are pleased to announce that Degree Days.net is now providing hourly temperature data to Degree Days.net Pro Solo/Team customers and Standard+ API customers. We recommend degree days for most energy-data analysis (and our degree days are already calculated accurately using detailed temperature readings), but hourly temperature data is useful for some specialist calculations. Find out more about Degree Days.net Pro and hourly temperature data here _.

DEGREE DAYS.NET

Enter a weather station ID if you have one, or search for any town or city in the world. US ZIP codes work too, as do postal codes for most

other countries.

Weather station ID

Station Search

Data type

Heating

Cooling

Custom

Regression

Temperature

Temperature units

Celsius

Fahrenheit

Base temperature

More...-22°F-21°F-20°F-19°F-18°F-17°F-16°F-15°F-14°F-13°F-12°F-11°F-10°F-9°F-8°F-7°F-6°F-5°F-4°F-3°F-2°F-1°F0°F1°F2°F3°F4°F5°F6°F7°F8°F9°F10°F11°F12°F13°F14°F15°F16°F17°F18°F19°F20°F21°F22°F23°F24°F25°F26°F27°F28°F29°F30°F31°F32°F33°F34°F35°F36°F37°F38°F39°F40°F41°F42°F43°F44°F45°F46°F47°F48°F49°F50°F51°F52°F53°F54°F55°F56°F57°F58°F59°F60°F61°F62°F63°F64°F65°F66°F67°F68°F69°F70°F71°F72°F73°F74°F75°F76°F77°F78°F79°F80°F81°F82°F83°F84°F85°F86°F87°F88°F89°F90°F91°F92°F93°F94°F95°F96°F97°F98°F99°F100°F101°F102°F103°F104°FMore... Include base temperatures nearby

Breakdown

Daily

Weekly

Monthly

Custom

Average

Period covered

Last 1 monthLast 2 monthsLast 3 monthsLast 4 monthsLast 5 monthsLast 6 monthsLast 7 monthsLast 8 monthsLast 9 monthsLast 10 monthsLast 11 monthsLast 12 monthsLast 13 monthsLast 14 monthsLast 15 monthsLast 16 monthsLast 17 monthsLast 18 monthsLast 19 monthsLast 20 monthsLast 21 monthsLast 22 monthsLast 23 monthsLast 24 monthsLast 25 monthsLast 26 monthsLast 27 monthsLast 28 monthsLast 29 monthsLast 30 monthsLast 31 monthsLast 32 monthsLast 33 monthsLast 34 monthsLast 35 monthsLast 36

monthsMore...

Generate Degree Days Degree Days.net is aimed primarily at those who are already experienced in using degree days for energy-related calculations. Provided you fit this description, you will probably find most of the options above to be fairly self explanatory (the less-obvious regression options have separate instructions ). However, we suggest you read the tips below as they do cover some important points. If you are new to degree days, you might want to skip straight to the brief introduction at the bottom of this page. You might also want to find out why 5,000+ energy professionals get data from here each month (and often a lot more frequently). CHOOSING THE BEST WEATHER STATION FOR LOCATION AND ACCURACY Degree Days.net calculates its degree days using temperature data from THOUSANDS UPON THOUSANDS OF WEATHER STATIONS WORLDWIDE. Ideally you'd use the weather station that's closest in climate to the location of the building that's energy consumption you're analyzing. This should give a better representation of the weather at the building than any "_reference_" station for the larger region in which

the building sits.

However, the best weather station to use often isn't the closest, because _data quality and coverage varies considerably between weather stations_. Degree Days.net will try to list the stations that it thinks can best represent your search location first. It considers the data quality and coverage of each station, as well as the distance from your search location. * AIRPORT ICAO STATIONS AND WMO STATIONS generally have the best quality data. The ICAO stations are at airports and have 4-character IDs; the WMO stations (often also at airports) have 5-digit IDs. Larger airports typically have many years of frequent, regular, accurate temperature readings - ideal for calculating high-quality degree days. Smaller airports and non-airport WMO stations are more variable: some are great, but others have a less-than-ideal recording frequency. For example, some only record the temperature every 6 hours or so, and some don't record at night. The star ratings shown with all ICAO and WMO stations will help you assess their data quality. * PERSONAL WEATHER STATIONS (PWS) are amateur run, typically installed in people's gardens, though some are run by businesses and other organizations. A minority of PWS have years of high-quality data, and these are usually shown with a long coverage bar and a good star rating (see further below for more on bars and stars). But the majority of PWS don't have a good data history, as people put them up and then move or lose interest and fail to keep them maintained, so their weather reporting becomes patchy or just stops altogether. Degree-day-based analysis usually requires a long, continuous data history, which most PWS don't have. So we generally recommend favouring higher-quality ICAO and WMO stations over PWS, even when the PWS are closer (which is very often the case). But there are some good PWS out there, and they can be useful when there's nothing else

around.

We have programmed Degree Days.net to make the best of the data that's available. We use sophisticated processes to identify and discard erroneous temperature readings and to fill in gaps with interpolated data. Figures based on estimated data are marked with a "_% estimated_" value so you can see where the detected problems lie. Degree Days.net is not unique in having to deal with less-than-perfect temperature data, as the vast majority of real-world weather stations are less than perfect in some shape or form. But, given the types of analysis for which degree days are used, we feel it's particularly important for us to highlight the underlying data-quality issues, to help people assess the accuracy of their analysis and decide which weather station(s) to get data from in the first place. Do make sure to use your own judgment when selecting whether or not to use data from any particular station - only you can determine the level of accuracy that you require. Also, please bear in mind that even though Degree Days.net has been carefully programmed to detect obvious errors in the source temperature data and to minimize the chance of calculation errors, we can not vouch for the accuracy of any degree days that Degree Days.net generates. COVERAGE BARS AND DATA-QUALITY STARS The vast majority of the weather stations you are likely to use are listed with additional information: a blue bar indicating how far back in time the station's data can go, and a star rating indicating the estimated quality of the data. If you hover your mouse over one of these stations, you should see a popup with more specifics. For stations with bars and stars, we calculate degree days using a slightly more accurate method than that which we use for stations without. If you are interested, you can read more about our calculation processes here . All the ICAO and WMO stations have bars and stars, and most of the better PWS have them too. Ideally we'd like to have bars and stars for all the PWS, but there are technical challenges that are preventing us from reaching that goal just yet. But we have got bars and stars for the vast majority of the better-quality stations, so it usually makes sense to focus on the stations with bars and stars first. HOW CAN I GET DATA FOR MY "DEGREE-DAY REGION"? The practice of splitting a country into a limited number of "_degree-day regions_" stems from a time when degree days were disseminated in print. Since that time the internet has made it feasible to make much larger quantities of data readily available. We think that it's generally much better to use degree-day data from a local weather station, as that will typically represent the weather at your building better than the data from any "_reference_" station

further away.

SEARCHING FOR WEATHER STATIONS IN THE US Our database covers a huge number of US weather stations. You should have no trouble finding nearby stations by searching for your city,

state, or zip code.

(US visitors might be interested to know that the 10 most popular US states for degree-day downloads are, in descending order of popularity: New York, California, Massachusetts, Pennsylvania, Texas, Ohio, Michigan, Maine, Connecticut, and Florida. And the most popular US cities are: Boston MA, Philadelphia PA, Denver Colorado, New York NY, Atlanta Georgia, Minneapolis Minnesota, Phoenix Arizona, Houston TX, Detroit MI, and Portland ME.) SEARCHING FOR WEATHER STATIONS IN THE UK There are a lot of UK weather stations stored in our database. In our experience, searching for city name and country name together works well (e.g. "London, UK"). You can also search for UK postcodes. SEARCHING FOR WEATHER STATIONS ELSEWHERE After the United States and the United Kingdom, the 10 most popular countries for data downloads are, in descending order: Canada, Spain, Ireland, Germany, France, India, Italy, Australia, Greece, and Sweden. India's coverage is patchy (although there are some good stations dotted about), but the rest of those popular countries, and many others (particularly in Europe), have good weather stations in the more populated areas at a minimum. Many countries are very well covered, although availability does vary from country to country. We suggest that initially you try searching for city name and country name together, using anglicized names (e.g. "Copenhagen, Denmark", or "Amsterdam, Netherlands"). Some countries just don't seem to register despite having stations in the database, so if searching for city and country doesn't work, try searching for city name alone. Postal code searches work well for most countries too. IF YOU'RE STRUGGLING TO FIND A GOOD STATION... You might try searching for towns and cities _near_ to your location. The search facility isn't perfect, and you'll often find that, whilst a search for one city won't turn up anything useful, a search for a

nearby city will.

IF ALL ELSE FAILS, you should hopefully find success by searching for the four-letter ICAO code of the airport that is closest to you. Most airports have a weather station, and many have high-quality weather data going back a long time. Once you've found a good weather station near your building, keep a record of the ID - you can use it next time you want updated degree

days.

If you discover any other useful tips for weather-station searching,

please let us know!

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CHOOSING APPROPRIATE BASE TEMPERATURES Degree days have traditionally come in a limited range of base temperatures such as 15.5°C, 18.5°C, and 65°F. But it's rare for real-world buildings to align accurately with any of these pre-prescribed base temperatures, and degree days with an inappropriate base temperature are a significant cause of inaccuracy in calculations relating to weather-dependent energy usage. Our article on the problems with common degree-day-based analysis approaches explains this issue in more detail. Degree Days.net will generate degree days to ANY BASE TEMPERATURE YOU CHOOSE. If you check the box to "_Include base temperatures nearby_", Degree Days.net will calculate your degree days to a range of base temperatures around the one that you specify. For most analysis, it's important to use degree days with a base temperature that makes sense for the building you are investigating. And buildings vary a lot. The following two resources should help you choose appropriately: * Our article on choosing base temperatures

should help you

understand the key factors to consider and make a rough estimate based on your knowledge of the building. * Our regression tool will test regressions of your energy-consumption data against degree days with different base temperatures to find the ones that give the best statistical fit. It is accessible via the web tool above by choosing "Regression" as the data type and following the instructions from there. Used together, these two resources should help you choose base temperatures that fit your data _and_ make logical sense for your building. Your subsequent analysis should be considerably more accurate as a result.

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GENERATING DATA TO MATCH YOUR UTILITY BILLS OR FUEL CONSUMPTION

RECORDS

Gas and electricity bills often don't line up neatly with calendar weeks or months. And it's rare for records of oil, LPG, or wood-burner consumption to fit the calendar. But irregular dates are not a problem: you can specify your dates as a _custom breakdown_ and Degree Days.net will generate the degree days to match. Just choose "Custom" as the breakdown and follow the instructions from there. Alternatively you can get _daily_ degree days and sum them together to get totals for each period of consumption that you have records for. This is a perfectly valid thing to do and will give you the same figures (albeit with a little more spreadsheet

work).

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DEGREE DAYS FOR BEGINNERS Degree days are key to reliably accounting for the weather in analysis of building energy consumption. However, it is easy for beginners to use them inappropriately, in ways that can lead to erroneous and misleading figures. And, without experience, it can be hard to turn degree-day-based analysis into actionable tasks that reduce consumption. There are often better ways for beginners to get started saving energy (like, for example, using a Kill-A-Watt meter

to find electrical

waste, and a cheap infrared laser thermometer

to find thermal

leaks). For these reasons, Degree Days.net is primarily aimed at the energy-saving professionals who are already experienced in using degree days as part of a broader energy-management strategy. However, if you are a degree-days beginner who isn't afraid to delve further into this useful form of energy data analysis, please read on: SO WHAT ARE DEGREE DAYS? Degree days are essentially a simplified representation of outside air-temperature data. They are widely used in the energy industry for calculations relating to the effect of outside air temperature on building energy consumption. "_Heating degree days_", or "_HDD_", are a measure of how much (in degrees), and for how long (in days), outside air temperature was _lower_ than a specific "_base temperature_" (or "_balance point_"). They are used for calculations relating to the energy consumption required to _heat_ buildings. "_Cooling degree days_", or "_CDD_", are a measure of how much (in degrees), and for how long (in days), outside air temperature was _higher_ than a specific base temperature. They are used for calculations relating to the energy consumption required to _cool_

buildings.

Degree days also have applications relating to plant growth ("_growing degree days_"). However, our focus is on making software for energy saving, so our expertise are in the energy-saving applications of heating and cooling degree days.

FURTHER INFORMATION

For a really basic introduction, you might like to read this Google Knol about degree days - it's ideal if you're looking for an easy-going explanation of degree days and what they're used for. If you are interested in finding out more, we suggest you read this article on degree days . It describes degree days and how they are commonly used, and, more importantly, it highlights the critical issues you should really be aware of if you are planning to use degree days in your own energy-related calculations. Although the bulk of the article is pitched more at energy-saving professionals than beginners, it does explain the basics

as it goes along.

Be warned, however: you might find it a little heavy going! If you're enthusiastic about energy in general, you might also be interested in the information we've compiled about energy-related degree programs and courses . It's something of a work in progress, but we already have a lot of interesting-looking academic

courses listed.

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WHAT NEXT?

* The articles linked above are well worth a read... * Our Degree Days.net quotes page has some of the comments that people have made about this site... * We've answered some frequently asked questions

...

* We've written an article about estimating the base temperature(s)

of a building ...

* We've written an article on linear regression analysis of energy consumption and degree days

- one of the most

widely-used techniques for monitoring and managing energy

consumption...

* And an article about how to calculate energy savings

after making

changes to reduce consumption (e.g. after installing new

insulation)...

* If you want data from a lot of locations, you should take a look at our desktop app - it lets you specify a big list of locations (which can be station IDs, longitude/latitude positions, or postal/zip codes) and then download data for all of them into a single spreadsheet... * If you want to integrate our data into your own automated software system, and you have programming skills, you should take a look at our

API ...

And that's about it at the moment - it's mainly about the data after all. If you've not done so already, why not head back up to the top of this page and give Degree Days.net a go?! Specify and Generate Your Degree Days Now � 2020 BizEE Software - About |

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