December in Eastmain is the snowiest month of the year. In December, the weather in Eastmain is typically freezing. Average daily high temperature in December is about 9 degrees below zero. On average, Eastmain has 27 snowy, 3 cloudy, and 1 sunny day in December. The snowfalls are usually moderate. December as well as January, February, May, and September is considered the most uncomfortable time to visit Eastmain.