The Weather in the EMBS countries

As one can imagine you may be interested in knowing what will be the weather of each of the cities you are going to visit. Well let's say that you will need warm clothes. For the academic year 2007/2009 it snowed in all the 4 countries.
In general cold temperatures are bearable except maybe if you stay the all month of January and February in Kassel.
Here are for your information the weather and temperatures you can expect for each semester.