Dorms in the winter are cold so everyone plugs in electric heaters and overloads the circuits causing fires. Dorms in summer are hot so everyone opens the windows and some fall out (usually after too much beer) which is a bad idea since the dorms are many stories high.
So now you can make an informed choice of which season is best. (Personally, since the fire stairs are always locked and not accessable, I would choose summer and not drink too much.)