Collinsville, Illinois — City Overview

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Living in Collinsville, summers are hot, with Jul highs around 87.8°F, while winters are chilly, with Feb lows around 25.4°F. Winter heating is a real budget factor — 4179 degree days means 4-5 months of meaningful energy bills. The area receives 54.8 inches of rainfall per year. Median household income: $63,155. With a 13.0% poverty rate and 64.3% homeownership, the community reflects a stable residential mix. Nearby cities: Fairview Heights (6mi S), O’Fallon (7mi SE), Granite City (9mi W). Air quality is Moderate — avg AQI 57 over the past week.

View Collinsville city guide

Updated September 16, 2026.

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