The most pleasant months of the year for the 57364 zip code are September, June and May. In the 57364 zip code, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 57364 zip code with an average high temperature of 87.5°, which ranks it as warmer than most places in South Dakota. March is the snowiest month in the 57364 zip code with 8.3 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.