Weather Forecast Chicago December 2024 Average Temperature. 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). The arctic air will expand in coverage by friday, with major cities like chicago and.

Average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and uv index. The average snowfall is 38.4 inches, but chicago only had around 20 inches the past two years.