July and August are the warmest months and the main holiday season. They're also the dampest - it might rain one day in three. So if you want to avoid the crowds and the rain, try May-June or September-October. In early autumn the leaves are turning and you can pick mushrooms and berries. Although winter is bitter, theatres open, the vodka comes out, buildings are warm and the snow is beautiful. Spring is slushy, muddy and generally horrible.
For detailed weather conditions at the time of your trip, visit one of these commercial weather sites:
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