In contrast to the common opinion, winter is truly best. Snow in December makes Christmas time really magical, but even in March I do not mind some snowy days.
At the beginning of March I spent some lovely days in Berlin, having breakfast at the market at Boxhagener Platz, walking around and making a guided tour through an abandoned bunker of the Second World War. Little bear was tired all the time, this inconsistent weather made him come out of hibernation way too early.