Charter Oak is a city of approximately 9,300 people in California, United States. Located in the Pacific Time Zone at 34.1°N latitude.
In 2025, Charter Oak recorded an average annual temperature of 65°F — about 1.5°F below the 30-year normal of 66°F. The hottest day reached 103°F in August; the coldest was 36°F in March. Total precipitation was 33 inches (wetter than usual). The wettest month was November.
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