Over the last weeks a very stable high pressure dominated weather situation was oberserved over Germany and Eastern Europe. While the same situation in summer would have resulted in a very warm period, the same isn’t true at autumn. One can observe relative high temperatures up to 15°C in 850hPa, but the temperature at the surface was often much cooler – known as a temperature inversion. Especially when it was foggy the whole day.
This is not an uncommon situation at autumn, but the very stable weather situation over this long time-period is definitely not oberserved all day at this region.