The most pleasant months of the year for Dover are June, August and July. In Dover, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Dover with an average high temperature of 82.0°, which ranks it as about average compared to other places in North Dakota. January is the snowiest month in Dover with 9.1 inches of snow, and 7 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.