Markham, Illinois — City Overview

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Living in Markham, summers are warm, peaking at 82.7°F in Jul, while winters are cold — Feb lows average 18.4°F. Winter heating is a real budget factor — 5710 degree days means 4-5 months of meaningful energy bills. The area receives 49.8 inches of rainfall per year. Median household income: $47,955. With a 23.2% poverty rate and 68.4% homeownership, the community reflects a stable residential mix. Air quality is Moderate — avg AQI 57 over the past week.

View Markham city guide

Updated October 23, 2026.

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