Monte Rio is a city of approximately 1,200 people in California, United States. Located in the Pacific Time Zone at 38.5°N latitude.
In 2025, Monte Rio recorded an average annual temperature of 60°F — about 6.6°F above the 30-year normal of 54°F. The hottest day reached 101°F in August; the coldest was 33°F in February. Total precipitation was 39 inches (wetter than usual). The wettest month was February.
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