Eureka, Illinois — City Overview

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Living in Eureka, summers are warm, peaking at 83.8°F in Jul, while winters are cold — Feb lows average 18.8°F. Winter heating is a real budget factor — 5427 degree days means 4-5 months of meaningful energy bills. The area receives 40.3 inches of rainfall per year. Median household income: $48,250. With a 13.3% poverty rate and 65.8% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 35 over the past week.

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Updated October 04, 2026.

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