January weather forecast and climate
Illinois, USA

Flag of Illinois, USA
Flag of Illinois, USA

Weather in January

January is brutally cold in Illinois, as even the day temperatures register below freezing in the northern regions. Freeport, in northern Illinois, registers average temperatures between 11°F (-11.7°C) to 29°F (-1.7°C), while Chicago is between 13°F (-10.6°C) to 34°F (1.1°C). The average temperatures statewide are in the 11°F (-11.7°C) to 43°F (6.1°C) range, with remarkable mildness in the southern regions.
Lake effect snow is dominant in the Lake Michigan region, which leads to increased precipitation on its southern shores. The skies are partly cloudy and occasionally gloomy as strong winds scourge the landscape. Ice skating rinks and snow-covered hills provide enjoyment in the winter to enthusiastic snow lovers. Ice fishing is popular with a large number of lakes present in Illinois.
Be sure to carry warm coats and dress in layers to counter the icy weather. Hot chocolate is a quick energizer during cold days. January is the snowiest month of the year in Illinois during the season of snowstorms.


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