Number of heating degree-days in the U.S. 1950-2023
There were around 3,805 heating degree-days in the United States in 2023. Degree-days are relative measurements of outdoor air temperature. Heating degree-days are deviations below the mean daily temperature of 65 degrees Fahrenheit (ca. 18 degree Celsius). Heating degree-days were more numerous in the mid 20th century.