Prosser, in Washington, United States, is home to roughly 5,900 people in the Pacific Time Zone at 46.2°N latitude.
In 2025, Prosser recorded an average annual temperature of 57°F. The hottest temperatures reached 104°F in September; the coolest were 15°F in February. Total precipitation for the year was 12 inches, with the wettest month being December. Snowfall for the year totaled approximately 3 inches.
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