With a population of around 21,800, Geneva sits in Illinois, United States. The city operates in the Central Time Zone.
In 2025, Geneva recorded an average annual temperature of 51°F — about 1.3°F above the 30-year normal of 49°F. The hottest day reached 93°F in May; the coldest was -10°F in February. Total precipitation was 34 inches (near normal). The wettest month was July.
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