Saxxat från Lonely Planet

July and August are the warmest months and the main holiday season. If you want to avoid the crowds, try May-June or September-early-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. Definitely try to avoid late Feb, March and early April.
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