Hartley is a city of approximately 2,500 people in California, United States. Located in the Pacific Time Zone at 38.4°N latitude.
In 2025, Hartley recorded an average annual temperature of 61°F — about 0.8°F below the 30-year normal of 62°F. The hottest day reached 103°F in September; the coldest was 33°F in February. Total precipitation was 23 inches (near normal). The wettest month was February.
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