In December, the weather in Mirnyy is typically freezing. Average daily high temperature in December is about 9 degrees below zero. On average, Mirnyy has 15 cloudy, 7 partly cloudy, 6 sunny, and 3 snowy days in December. The snowfalls are usually light. December as well as January, February, April, and October is considered the most uncomfortable time to visit Mirnyy.