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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.
At this time of the year discussion of growing-degree days is often synonymous with annual bluegrass (Poa annua L.) seedhead control. Originally, growing degree-day (GDD) models were developed to predict when Poa annua seedheads would emerge, and the peak production period.n this article I hope to clarify, or add more confusion to, the concept of using GDD for Poa annua seedhead control. Growing Degree Day. A degree day, also known as growing degree days and heat units, is a measure of heat above a threshold for one day.