Lemont, in Illinois, United States, is home to roughly 16,800 people in the Central Time Zone at 41.7°N latitude.
In 2025, Lemont recorded an average annual temperature of 51°F — about 1.1°F below the 30-year normal of 52°F. The hottest day reached 93°F in June; the coldest was -9°F in February. Total precipitation was 36 inches (wetter than usual). The wettest month was June.
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