January in Kostomucsha is the most freezing month of the year. In January, the weather in Kostomucsha is typically freezing. Average daily high temperature in January is about 9 degrees below zero. On average, Kostomucsha has 19 snowy, 10 cloudy, and 2 sunny days in January. The snowfalls are usually light. January as well as April, May, June, and August is considered the most uncomfortable time to visit Kostomucsha.