Weather Forecast Chicago December 2024 Fahrenheit. A risky day is not a direct prediction of precipitation (rain/snow) but instead a forecast of ideal. Weather.com brings you the most accurate monthly weather forecast for chicago, il with average/record and high/low temperatures, precipitation and more.

Daily high temperatures decrease by 8°f, from 42°f to 34°f, rarely falling below 20°f or exceeding 55°f. 30dayweather long range weather forecasts predict ideal conditions for a storm.