Lanark, Illinois — City Overview

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Living in Lanark, summers are warm, peaking at 83.8°F in Jul, while winters are cold — Feb lows average 13.5°F. At 6229 heating degree days per year, winter energy bills are significant. With 36.5 inches annually, the climate is relatively dry. Median household income: $67,031. With a 15.0% poverty rate and 78.5% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 43 over the past week.

View Lanark city guide

Updated October 19, 2026.

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