December in Belostok is the windiest month of the year. In December, the weather in Belostok is typically freezing. Average daily high temperature in December is about 11 degrees below zero. On average, Belostok has 23 cloudy, 6 snowy, and 2 sunny days in December. The snowfalls are usually light. December as well as January, February, and October is considered the most uncomfortable time to visit Belostok.