Colchester, Illinois — City Overview

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Living in Colchester, summers are hot, with Jul highs around 85.3°F, while winters are cold — Feb lows average 19.4°F. Winter heating is a real budget factor — 5220 degree days means 4-5 months of meaningful energy bills. The area receives 40.4 inches of rainfall per year. Median household income: $56,875. With a 12.0% poverty rate and 73.0% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 44 over the past week.

View Colchester city guide

Updated September 11, 2026.

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