December in Uglegorsk is the sunniest and the most freezing month of the year. In December, the weather in Uglegorsk is typically freezing. Average daily high temperature in December is about 18 degrees below zero. On average, Uglegorsk has 18 sunny, 7 partly cloudy, 3 snowy, and 3 cloudy days in December. The snowfalls are usually light. December as well as January and February is considered the most uncomfortable time to visit Uglegorsk.