The most pleasant months of the year for the 57426 zip code are June, August and July. In the 57426 zip code, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 57426 zip code with an average high temperature of 83.6°, which ranks it as cooler than most places in South Dakota. November is the snowiest month in the 57426 zip code with 7.8 inches of snow, and 7 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.