The most pleasant months of the year for the 98278 zip code are August, July and September. In the 98278 zip code, there are 2 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for the 98278 zip code with an average high temperature of 71.2°, which ranks it as one of the coolest places in Washington. December is the snowiest month in the 98278 zip code with 1.4 inches of snow, and 4 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.