December in Bol'shie Klyuchishchi is the snowiest and the windiest month of the year. In December, the weather in Bol'shie Klyuchishchi is typically freezing. Average daily high temperature in December is about 5 degrees below zero. On average, Bol'shie Klyuchishchi has 17 cloudy, 13 snowy, and 1 sunny day in December. The snowfalls are usually light.