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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.
Typically, heating degree days are calculated as how much colder the mean temperature at a location is than 65Â°F on a given day. For example, if a location experiences a mean temperature of 55Â°F on a certain day, there were 10 HDD (Heating Degree Days) that day because 65 - 55 = 10.