Forsyth is a city of approximately 3,600 people in Illinois, United States. Located in the Central Time Zone at 39.9°N latitude.
In 2025, Forsyth recorded an average annual temperature of 54°F — about 0.8°F above the 30-year normal of 53°F. The hottest day reached 93°F in June; the coldest was -6°F in January. Total precipitation was 30 inches (drier than usual). The wettest month was April.
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