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Wiktionary (0.00 / 0 votes) Rate this definition: degree day (Noun). A measure of heating or cooling, computed as the integral of a function of time that generally varies with temperature.iktionary (0.00 / 0 votes) Rate this definition: degree day (Noun). A measure of heating or cooling, computed as the integral of a function of time that generally varies with temperature.
 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.