The most pleasant months of the year for Redstone are June, September and August. In Redstone, there are 5 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Redstone with an average high temperature of 84.7°, which ranks it as about average compared to other places in South Dakota. March is the snowiest month in Redstone with 6.9 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.