Marengo, Illinois — City Overview

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Living in Marengo, summers are warm, peaking at 83.0°F in Jul, while winters are cold — Jan lows average 15.7°F. At 6216 heating degree days per year, winter energy bills are significant. With 39.9 inches annually, the climate is relatively dry. Median household income: $71,196. With a 15.7% poverty rate and 63.2% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 48 over the past week.

View Marengo city guide

Updated October 21, 2026.

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