Maryville, Illinois — City Overview

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Living in Maryville, summers are hot, with Jul highs around 87.9°F, while winters are chilly, with Feb lows around 25.1°F. Winter heating is a real budget factor — 4198 degree days means 4-5 months of meaningful energy bills. The area receives 54.8 inches of rainfall per year. Median household income: $96,373. With a 3.5% poverty rate and 86.0% homeownership, the community reflects a stable residential mix. Air quality is Moderate — avg AQI 51 over the past week.

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Updated October 23, 2026.

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