December weather forecast and climate
Illinois, USA

Flag of Illinois, USA
Flag of Illinois, USA

Weather in December

December begins the winter season cold in Illinois with a steep decline in temperatures. The average high temperatures are in the cold to the mild zone of 32°F (0°C) to 46°F (7.8°C), while the average low temperatures are in the freezing range of 16°F (-8.9°C) to 29°F (-1.7°C).
The precipitation is mainly in the form of snow and ice, as rainfall hardly crosses 2" (51mm) to 3" (76mm) statewide. Snow covers the ground and registers in the 6" (152mm) to 12" (305mm) in the central to northern regions. The south receives light snowfall to the tune of 1" (25mm) to 3" (76mm).
Illinois turns into a winter wonderland as a white Christmas dawns in the upper half of the state. Strong winds add to the chilliness as the daily sunshine limits to 4 hours, and the days become short. Warm winter coats, gloves, and caps drop out of the closets as the partly cloudy skies provide little chance of warm sunshine. December has rare periods of favorable weather for a visit to Illinois.
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