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The English version of our glossary is currently under construction and will be regularly updated.

Freezing degree days (FDDs)

A standard for the intensity of below-zero temperatures in a given timeframe, frequently used in the USA.

Describes a simplified relation between thermodynamics and growth processes. In this regard, the melting process is not included. To calculate the freezing degree days, the number of days with below-zero temperatures is multiplied by the negative degrees. Days with above-zero temperatures are not included.