While inspecting the countryside near our measurement site we observed something that explains a lot of what has happened earlier. We saw a factory manufacturing clouds:

As you can observe also from this picture, the sky is almost clear of clouds, except for the one being produced. Also this picture of the Doom of Aachen shows no trace of clouds, and the scorchio is indescribable.

But only a few hours later the hard-working Germans have filled the sky with nice cloud cover, that covers us from the scorching Sun.

Obviously the constantly cloudy and rainy weather in Bavaria was due to overproduction by Bavarian cloud industry.