Mill Plain is a city of approximately 7,900 people in Washington, United States. Located in the Pacific Time Zone at 45.6°N latitude.
Mill Plain has a temperate oceanic climate. Average annual temperature is 55°F, with January lows around 36°F and July highs near 82°F. The city averages 37 inches of precipitation and 4 inches of snow per year. The wettest month is typically December; the driest is July.
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