Fairmont City is a city of approximately 2,500 people in Illinois, United States. Located in the Central Time Zone at 38.6°N latitude.
In 2025, Fairmont City recorded an average annual temperature of 57°F — about 0.7°F above the 30-year normal of 57°F. The hottest day reached 97°F in July; the coldest was -0°F in February. Total precipitation was 40 inches (near normal). The wettest month was April.
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