December in Yuzhno-Sakhalinsk is the snowiest and the windiest month of the year. In December, the weather in Yuzhno-Sakhalinsk is typically freezing. Average daily high temperature in December is about 5 degrees below zero. On average, Yuzhno-Sakhalinsk has 19 snowy, 10 cloudy, and 2 sunny days in December. The snowfalls are usually heavy.