January in Koslan is the most freezing month of the year. In January, the weather in Koslan is typically freezing. Average daily high temperature in January is about 13 degrees below zero. On average, Koslan has 16 snowy, 13 cloudy, and 2 sunny days in January. The snowfalls are usually light. January as well as February, April, May, and September is considered the most uncomfortable time to visit Koslan.