Growing degree days (GDD), also called growing degree units (GDUs), are a heuristic tool in phenology. GDD are a measure of heat accumulation used by horticulturists, gardeners, and farmers to predict plant and pest development rates such as the date that a flower will bloom or a crop reach maturity.
GDD is calculated as $frac{T_{min}-T_{max}}{2}- T_{base}$ - so a quick check of the units would indicate that they are in the same units as T, i.e., degrees C. However, they are usually presented without units.
Why is this?
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