The most pleasant months of the year for Morton are June, August and July. In Morton, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Morton with an average high temperature of 82.0°, which ranks it as one of the coolest places in South Dakota. January is the snowiest month in Morton with 9.2 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.