Degree Days Calculator

This online calculator pulls weather station data--including heating and cooling degree days (HDD and CDD)--from weather stations in the United States and Canada. EPA uses this weather data to calculate your building's or industrial plant's weather normalized energy usage data.

Enter in your information below to get started.


*

*

*

*

*

About HDD and CDD

Heating Degree Days (HDD) and Cooling Degree Days (CDD) are a measure of how much heating or cooling is necessary given the recorded temperatures for a particular weather station for a given time period. They are computed relative to a base of 65°F. Learn More

This data comes from the National Oceanic and Atmospheric Agency's (NOAA) Global Surface Summary of the Day (GSOD) dataset.