The most pleasant months of the year for Poso Park are May, October and April. In Poso Park, there are 2 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Poso Park with an average high temperature of 94.2°, which ranks it as warmer than most places in California. January is the snowiest month in Poso Park with 1.3 inches of snow, and 4 months of the year have significant snowfall. Days with noticeable humidity are rare throughout the year.