Gilson, Illinois — City Overview

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Living in Gilson, summers are warm, peaking at 84.6°F in Jul, while winters are cold — Feb lows average 18.2°F. Winter heating is a real budget factor — 5499 degree days means 4-5 months of meaningful energy bills. With 39.5 inches annually, the climate is relatively dry. Median household income: $64,063. Nearby cities: Galesburg (11mi NW), Canton (23mi SE), Galva (23mi NE). Air quality is Good — avg AQI 35 over the past week.

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Updated October 12, 2026.

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