The most pleasant months of the year for Dunkel are September, June and May. In Dunkel, there are 2 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Dunkel with an average high temperature of 87.7°, which ranks it as warmer than most places in South Dakota. March is the snowiest month in Dunkel with 9.3 inches of snow, and 7 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.