With a population of around 22,300, Darien sits in Illinois, United States. The city operates in the Central Time Zone.
In 2025, Darien recorded an average annual temperature of 51°F — about 1.2°F below the 30-year normal of 52°F. The hottest day reached 93°F in June; the coldest was -8°F in February. Total precipitation was 38 inches (wetter than usual). The wettest month was June.
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