Background information

Context The biologically effective degree days index provides information about the growing season.

Definition The biologically effective degree days (°C) index is the sum of daily mean temperatures above 10°C and less than 30°C for a given period.

Data Sources The biologically effective degree days index is calculated from an ensemble of five global climate model (GCM) simulations for two CMIP5 scenario projections: RCP2.6 (with low greenhouse gas emissions) and RCP8.5 (with high greenhouse gas emissions). Projected changes are calculated relative to a (1981-2010) ERA5 reference period.

Understand A positive value indicates higher biological effectiveness than the reference period while a negative value indicates lower biological effectiveness than the reference period.

Supporting Information The data was collated on behalf of the Copernicus Climate Change Service (C3S). Further information about this index can be found in the C3S documentation resources in the Climate Data Store.


Visualisation and Navigation Monthly and annual projected changes in the biologically effective degree days index are presented as 30-year means for two CMIP5 scenarios; RCP2.6 with low greenhouse gas emissions and RCP8.5 with high greenhouse gas emissions.

Statistics for biologically effective degree days are also available via the "Explore in Detail" button as national, sub-national and trans-national area-means for which time series data can be plotted.

Projected change in biologically effective degree days

Content in the European Climate Data Explorer pages is delivered by the Copernicus Climate Change Service (C3S) implemented by ECMWF.

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This translation is generated by eTranslation, a machine translation tool provided by the European Commission.