The most pleasant months of the year for the 61077 zip code are September, June and August. In the 61077 zip code, there are 5 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 61077 zip code with an average high temperature of 84.2°, which ranks it as cooler than most places in Illinois. December is the snowiest month in the 61077 zip code with 10.4 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.