Weather Forecast Chicago December 2025

Weather Forecast Chicago December 2025. Precipitation and snowfall will be below normal, with the most snow in late december, from late january into early february, and from late february into early march. A shift in chicago's weather is observed as november turns into december, with the average high temperature reducing from a frosty 46°f (7.8°c) to a cold 35.8°f (2.1°c).

December weather in chicago illinois, united states. Daily high temperatures decrease by 8°f, from 42°f to 34°f, rarely falling below 20°f or exceeding 55°f.