Like the U.S., Russia is a large country that spans several climate zones. But most of Russia has a continental climate with two main seasons: a warm summer with occasional heat waves and an icy cold winter. In the east, St. Petersburg’s location near the Baltic Sea keeps some of the extremes in check. But in Moscow and Siberia there’s no nearby body of water to mitigate the weather, resulting in cold, long winters and warm, humid summers. Winter snows start in November (or even October in parts of Siberia) and the snow blanket persists well into spring.