Glen Carbon, Illinois — City Overview

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Living in Glen Carbon, summers are hot, with Jul highs around 87.8°F, while winters are chilly, with Feb lows around 25.3°F. Winter heating is a real budget factor — 4192 degree days means 4-5 months of meaningful energy bills. Annual rainfall reaches 55.3 inches, mostly summer thunderstorms. Median household income: $92,002. With a 7.4% poverty rate and 66.5% homeownership, the community reflects a stable residential mix. Nearby cities: Granite City (9mi W), Wood River (10mi NW), Fairview Heights (11mi S). Air quality is Good — avg AQI 43 over the past week.

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Updated October 12, 2026.

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