December in Ostrov Bol'shoy Oleny is the windiest month of the year. In December, the weather in Ostrov Bol'shoy Oleny is typically freezing. Average daily high temperature in December is about 3 degrees below zero. On average, Ostrov Bol'shoy Oleny has 16 snowy, 13 cloudy, and 2 sunny days in December. The snowfalls are usually light.