The group layer summer days 1981-2010 relative to 1951-1980 is available for that period and contains a map layer. This reflects the change in the mean number of summer days per year, which occurred in comparison with the mean number of summer days per year of the periods 1981-2010 and 1951-1980. It is calculated from the observation data of the periods 1951-1980 and 1981-2010 (see group layer air temperature — summer days). Data base is data from the German Weather Service.
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