Fairfield, Illinois — City Overview

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Living in Fairfield, summers are hot, with Jul highs around 88.1°F, while winters are chilly, with Feb lows around 27.0°F. Winter heating is a real budget factor — 4024 degree days means 4-5 months of meaningful energy bills. The area receives 46.7 inches of rainfall per year. Median household income: $43,681. With a 18.7% poverty rate and 66.8% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 34 over the past week.

View Fairfield city guide

Updated October 05, 2026.

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