Northfield is a city of approximately 5,500 people in Illinois, United States. Located in the Central Time Zone at 42.1°N latitude.
In 2025, Northfield recorded an average annual temperature of 51°F — right at the 30-year normal of 51°F. The hottest day reached 97°F in June; the coldest was -8°F in February. Total precipitation was 31 inches (near normal). The wettest month was June.
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