In December, the weather in Baykalsk is typically freezing. Average daily high temperature in December is about 9 degrees below zero. On average, Baykalsk has 15 partly cloudy, 13 sunny, 2 snowy, and 1 cloudy day in December. The snowfalls are usually light. December as well as January, February, April, and October is considered the most uncomfortable time to visit Baykalsk.