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Figure

Growing degree days

Figure Created 29 Oct 2021 Published 20 Jan 2022 Last modified 20 Jan 2022
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The growing degree days index represents a measure of the accumulated heat available for vegetation growth. It is calculated as the accumulated sum over the year of the daily mean temperature exceedances of a base threshold (see the ETC-CCA Technical Paper for details). A base temperature of +5 °C is considered as representative for most European crops. Other definitions of the index are possible, including variations of the minimum temperature, the use of an upper temperature threshold, and restrictions to a given growing season.
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