Streamwood, in Illinois, United States, is home to roughly 40,600 people in the Central Time Zone at 42°N latitude.
In 2025, Streamwood recorded an average annual temperature of 50°F — right at the 30-year normal of 51°F. The hottest day reached 93°F in June; the coldest was -10°F in February. Total precipitation was 35 inches (wetter than usual). The wettest month was July.
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