Monmouth, Illinois — City Overview

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Living in Monmouth, summers are warm, peaking at 84.2°F in Jul, while winters are cold — Feb lows average 17.6°F. Winter heating is a real budget factor — 5506 degree days means 4-5 months of meaningful energy bills. With 38.3 inches annually, the climate is relatively dry. Median household income: $58,991. With a 18.5% poverty rate and 69.3% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 41 over the past week.

View Monmouth city guide

Updated October 27, 2026.

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