The most pleasant months of the year for Bossko are June, August and July. In Bossko, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Bossko with an average high temperature of 83.4°, which ranks it as cooler than most places in South Dakota. February is the snowiest month in Bossko with 8.6 inches of snow, and 7 months of the year have significant snowfall. But there some days when the humidity becomes unpleasant, especially in July and August.