In December, the weather in Uglegorsk is typically freezing. Average daily high temperature in December is about 19 degrees below zero. On average, Uglegorsk has 19 cloudy, 5 sunny, 5 partly cloudy, and 2 snowy days in December. The snowfalls are usually light. December as well as January, February, and November is considered the most uncomfortable time to visit Uglegorsk.