The most pleasant months of the year for Marblemount are August, July and September. In Marblemount, there are 3 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for Marblemount with an average high temperature of 77.6°, which ranks it as about average compared to other places in Washington. December is the snowiest month in Marblemount with 15.5 inches of snow, and 5 months of the year have significant snowfall. There are few days during the year when the humidity is even noticable.