The most pleasant months of the year for Sullivan village are June, August and July. In Sullivan village, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Sullivan village with an average high temperature of 82.4°, which ranks it as warmer than most places in Wisconsin. December is the snowiest month in Sullivan village with 12.2 inches of snow, and 6 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.