In September the weather was again unusual. It hadn’t been so dry that month for years. In addition, it was too warm and too sunny, as determined by the German Weather Service.
Offenbach – September 2021 was the driest in 15 years. The German Weather Service (DWD) measured 45 percent less precipitation than the average for the reference period 1961 to 1990.
Compared with the period 1991 to 2020, the minus was almost 50 percent, as the DWD reported in Offenbach on Wednesday. “On the whole, September was too warm, very dry and sunny,” reported the DWD after initial evaluations of the results from its around 2000 measuring stations.
The mean temperature in September 2021 was 15.2 degrees, 1.9 degrees above the value of the internationally valid reference period 1961 to 1990. Compared to the current and warmer period 1991 to 2020, the deviation was plus 1.4 degrees. The warmest day was therefore with 30.0 degrees on the 9th of the month in Huy-Pabstorf in the Harz (Saxony-Anhalt). In Merklingen (Baden-Württemberg) and Oberstdorf (Bavaria) there was the nationwide lowest value of 0.9 degrees on the 23rd.
On average, around 35 liters of rain fell per square meter this September. There was occasional heavy rain: On September 26, there was the highest daily rainfall in Kreuth-Glashütte in the foothills of the Alps with 74.9 liters per square meter. The foothills of the Alps were also the region with the most precipitation, with a monthly total of over 160 liters per square meter.
At 175 hours, the sunshine duration exceeded its September target of 150 hours (period 1961 to 1990) by around 15 percent. Compared to 1991 to 2020, the positive deviation was a good 10 percent. The sun showed itself in the south for over 230 hours, twice as long as in the cloud-covered north.
For the next few days, the DWD issued a storm warning for the Schleswig-Holstein North Sea coast. From Wednesday 8 p.m. to Thursday 11 a.m., hurricane-like gusts can occur in the North Sea at speeds of up to 110 kilometers per hour from the southwest, later from the west. Trees could be uprooted and roofs damaged. In addition, heavy rain is expected on Friday night. Up to 35 liters per square meter could fall within six hours. dpa
