The most pleasant months of the year for Caledonia are August, July and June. In Caledonia , there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Caledonia with an average high temperature of 79.8°, which ranks it as cooler than most places in Wisconsin. January is the snowiest month in Caledonia with 13.6 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.