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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.
DEFINITION of 'Heating Degree Day - HDD' The number of degrees that a day's average temperature is below 65 o Fahrenheit (18 o Celsius), the temperature below which buildings need to be heated. The price of weather derivatives traded in the winter is based on an index made up of monthly HDD values.