The most pleasant months of the year for Beaver are June, September and August. In Beaver, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Beaver with an average high temperature of 85.7°, which ranks it as about average compared to other places in South Dakota. December is the snowiest month in Beaver with 6.5 inches of snow, and 7 months of the year have significant snowfall. July is the most humid month, though it is still relatively mild compared to many other places.