December in Zheleznogorsk is the snowiest month of the year. In December, the weather in Zheleznogorsk is typically freezing. Average daily high temperature in December is about 11 degrees below zero. On average, Zheleznogorsk has 12 snowy, 10 cloudy, 5 partly cloudy, and 4 sunny days in December. The snowfalls are usually light. December as well as January, February, September, and October is considered the most uncomfortable time to visit Zheleznogorsk.