Weather Forecast Chicago December 2024 Weather. Big changes will unfold during the opening weeks of 2025. Discover the most accurate weather forecast for chicago in december 2024.

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. Get the monthly weather forecast for chicago o’hare international airport, il, including daily high/low, historical averages, to help you plan ahead.