Millbrook, Illinois — City Overview

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Living in Millbrook, summers are warm, peaking at 83.6°F in Jul, while winters are cold — Feb lows average 17.2°F. Winter heating is a real budget factor — 5781 degree days means 4-5 months of meaningful energy bills. The area receives 45.8 inches of rainfall per year. Median household income: $116,875. With a 7.0% poverty rate and 95.3% homeownership, the community reflects a stable residential mix. Air quality is Moderate — avg AQI 59 over the past week.

View Millbrook city guide

Updated October 27, 2026.

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