The most pleasant months of the year for Alpha are June, September and August. In Alpha, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Alpha with an average high temperature of 86.1°, which ranks it as warmer than most places in South Dakota. February is the snowiest month in Alpha with 7.7 inches of snow, and 7 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.