Willowbrook, in Illinois, United States, is home to roughly 2,100 people in the Central Time Zone at 41.5°N latitude.
In 2025, Willowbrook 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 August; the coldest was -7°F in January. Total precipitation was 35 inches (near normal). The wettest month was July.
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