Mount Sterling is a city of approximately 2,000 people in Illinois, United States. Located in the Central Time Zone at 40°N latitude.
In 2025, Mount Sterling recorded an average annual temperature of 55°F — about 1.5°F above the 30-year normal of 53°F. The hottest day reached 96°F in June; the coldest was -7°F in January. Total precipitation was 30 inches (drier than usual). The wettest month was July.
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