Illiopolis, Illinois — City Overview

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Living in Illiopolis, summers are hot, with Jul highs around 85.0°F, while winters are cold — Feb lows average 21.1°F. Winter heating is a real budget factor — 4882 degree days means 4-5 months of meaningful energy bills. The area receives 43.0 inches of rainfall per year. Median household income: $77,292. With a 8.5% poverty rate and 75.8% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 38 over the past week.

View Illiopolis city guide

Updated October 15, 2026.

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