The most pleasant months of the year for Elmo are August, July and June. In Elmo, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Elmo with an average high temperature of 81.8°, which ranks it as cooler than most places in Montana. December is the snowiest month in Elmo with 13.6 inches of snow, and 7 months of the year have significant snowfall. Days with noticeable humidity are rare throughout the year.