The most pleasant months of the year for Granite are July, August and September. In Granite, there are 4 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for Granite with an average high temperature of 81.3°, which ranks it as cooler than most places in Oregon. December is the snowiest month in Granite with 25.9 inches of snow, and 7 months of the year have significant snowfall. There are few days during the year when the humidity is even noticable.