The most pleasant months of the year for Robertson are August, July and June. In Robertson, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Robertson with an average high temperature of 81.5°, which ranks it as cooler than most places in Wyoming. January is the snowiest month in Robertson with 8.9 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.