The most pleasant months of the year for Berkley are September, June and August. In Berkley, there are 5 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Berkley with an average high temperature of 84.6°, which ranks it as warmer than most places in Iowa. December is the snowiest month in Berkley with 7.9 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.