Please don't flame me if this has been covered before. I tried a search but couldn't find anything conclusive.

Basically can you fight battles in seasons other than Wet/dry all in summer?

One of the Barbarossa campaign battles starts off in the snow but on the main camapign its all Summer maps. I have read the 1st battle summer, 2nd, Autumn, 3rd Winter etc but that never seems to hold true.

If this has been covered then I am sorry.