Germany weather is mild, characterized by its hot summers and its cold winters,
Germany has a mild weather, with hot summers and cold winters, although long periods of freeze or snow are very rare. It rains during the year, specially in July. During the summer, the storms usually bring thunders and lightning storms. It can get to be very cold in winter, and the lakes and channels of the country usually freeze. The average temperatures are 2°C in winter and 24°C in summer.
It is convenient to bring light clothes for summer, and warm ones for winter. It is also convenient to have a raincoat as part of the luggage, no matter the time of the year in which you travel.
Much of Germany lies some distance closer to the equator than the UK. You might therefore expect that the general princple would be that the weather would be warmer. You would be wrong. With the exception of the North West of the country, Germany is a long way from the sea and thus, it experiences a continental climate not at all like the temperate maritime climate enjoyed by the UK. This means that the winters are colder than in the UK and the summers are hotter.
The summers can often be uncomfortably hot but there is one other thing of which you should be aware. Rain storms, often with thunder can arrive vey suddenly even on hot days with otherwise sunny weather. Being out in one of these does not just involve getting very wet. They arise from air which has been over the mountains and is very cold. The water may be only just above freezing and given that the volume is roughly equivalent to having a bucketful chucked over you every second, you should be able to appreciate that getting stuck out in this kind of rain can be seriously bad for you.