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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.
But if you want to understand what degree days really are (and personally I think you really should understand this before using them...), please read on. There are three main types of degree days: heating degree days, cooling degree days, and growing degree days.