Glen Ellyn is a city of approximately 28,200 people in Illinois, United States. Located in the Central Time Zone at 41.9°N latitude.
In 2025, Glen Ellyn recorded an average annual temperature of 51°F — about 1.4°F below the 30-year normal of 52°F. The hottest day reached 94°F in June; the coldest was -9°F in February. Total precipitation was 35 inches (near normal). The wettest month was July.
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