Janesville, Illinois — City Overview

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Living in Janesville, summers are hot, with Jul highs around 85.9°F, while winters are cold — Feb lows average 22.6°F. Winter heating is a real budget factor — 4756 degree days means 4-5 months of meaningful energy bills. The area receives 42.3 inches of rainfall per year. With a 68.2% poverty rate and 16.7% homeownership, the community reflects a stable residential mix. Air quality is Good — avg AQI 36 over the past week.

View Janesville city guide

Updated October 16, 2026.

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