I've been to the Black Forest on holiday and it is very hot. Berlin may not be but there are parts of Germany which get hot weather regularly.
This is my point though. We regularly have brief periods of extreme weather but, like the UK, we don’t have any of the measures you highlighted like altered working days, houses painted white etc and bringing my post back on topic we don’t have the hysteria. If it’s a lack of petrol or pasta or bog roll, or a day of hot weather, or a light dusting of snow, you do like a panic…KEEP CALM AND CARRY ON