Weather Calendar December 2025 Chicago Illinois
Weather Calendar December 2025 Chicago Illinois. Discover the most accurate weather forecast for chicago in december 2025. Chance, either low or high, is not a direct prediction of rain, snow, or sleet.
Chicago weather in december 2025. 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).