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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.
One degree day results when the average temperature for a. day is one degree over the threshold temperature. With codling moth (50 degrees F threshold. temperature), on a day when the average temperature was 51 degrees F, one degree day.