December in Zheleznogorsk-Ilimsky is the snowiest month of the year. In December, the weather in Zheleznogorsk-Ilimsky is typically freezing. Average daily high temperature in December is about 17 degrees below zero. On average, Zheleznogorsk-Ilimsky has 12 snowy, 8 cloudy, 6 sunny, and 5 partly cloudy days in December. The snowfalls are usually light. December as well as January, February, September, and November is considered the most uncomfortable time to visit Zheleznogorsk-Ilimsky.