The most pleasant months of the year for the 97604 zip code are September, June and August. In the 97604 zip code, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 97604 zip code with an average high temperature of 83.4°, which ranks it as about average compared to other places in Oregon. December is the snowiest month in the 97604 zip code with 31.0 inches of snow, and 8 months of the year have significant snowfall. There are few days during the year when the humidity is even noticable.