Waterman, in Illinois, United States, is home to roughly 1,500 people in the Central Time Zone at 41.8°N latitude.
In 2025, Waterman recorded an average annual temperature of 50°F — about 2.5°F above the 30-year normal of 48°F. The hottest day reached 92°F in June; the coldest was -11°F in February. Total precipitation was 31 inches (drier than usual). The wettest month was July.
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