The most pleasant months of the year for the 83121 zip code are August, July and June. In the 83121 zip code, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 83121 zip code with an average high temperature of 81.2°, which ranks it as cooler than most places in Wyoming. December is the snowiest month in the 83121 zip code with 9.5 inches of snow, and 9 months of the year have significant snowfall. There are few days during the year when the humidity is even noticable.