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Living in Castleton, summers are warm, peaking at 84.1°F in Jul, while winters are cold — Feb lows average 17.7°F. Winter heating is a real budget factor — 5625 degree days means 4-5 months of meaningful energy bills. With 38.7 inches annually, the climate is relatively dry. Nearby cities: Kewanee (14mi NW), Lacon (17mi E), Galva (18mi W). Air quality is Good — avg AQI 44 over the past week.
Updated September 05, 2026.
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