Based on hourly averages of the wind speed and wind direction, multi year strength windroses (at least 5 connected or consecutive years are used) of the relevant stations during the rolling 10 years back are created. In order to be able to make representative statements about the wind conditions at a station with the help of a starch wind rose, conditions regarding data availability, continuity of the measuring site, the homogeneity of the measuring method and uniform sensor height per site were taken into account. Quality conditions are: • at least 85 % of the data are available per month • not any relocation of the measuring site during the evaluation period • not any relocation of the sensor height during the evaluation period • the sensor height is situated within an interval of height from 7 m to 25 m over ground (including outside barriers) These data originate from stations of the DWD and legally and qualitatively equivalent partner network stations.

Based on hourly averages of the wind speed and wind direction, multi year strength windroses (at least 5 connected or consecutive years are used) of the relevant stations during the rolling 10 years back are created. In order to be able to make representative statements about the wind conditions at a station with the help of a starch wind rose, conditions regarding data availability, continuity of the measuring site, the homogeneity of the measuring method and uniform sensor height per site were taken into account. Quality conditions are: • at least 85 % of the data are available per month • not any relocation of the measuring site during the evaluation period • not any relocation of the sensor height during the evaluation period • the sensor height is situated within an interval of height from 7 m to 25 m over ground (including outside barriers) These data originate from stations of the DWD and legally and qualitatively equivalent partner network stations.