Chicago, Illinois – Bitter winter conditions are lining up to return across Illinois beginning Thursday, bringing the risk of subzero temperatures, icy travel, and occasional snow through the following Wednesday.
According to the National Weather Service Climate Prediction Center, much of Illinois is expected to see below-normal temperatures during the Jan. 15–21 period, driven by a broad trough of Arctic air settling over the central United States. While precipitation signals remain near normal, the cold air mass will be capable of turning even light snowfall into hazardous road conditions.
Northern Illinois, including Chicago, Rockford, and DeKalb, faces the highest risk for subzero wind chills during the overnight and early morning hours. Prolonged cold could strain heating systems and increase the risk of frozen pipes, especially in older homes. Illinois Department of Transportation crews may need to treat roadways repeatedly if snow develops during the coldest periods, as ice can linger well after snowfall ends.
Central Illinois cities such as Peoria, Bloomington, and Springfield are also expected to dip well below seasonal averages. Even minor snow accumulations could create slick conditions on Interstate 55 and Interstate 74, particularly during morning commutes. Farther south, areas including Effingham and Mount Vernon may avoid the coldest readings but will still contend with sharply colder-than-normal conditions.
Residents are urged to prepare now by checking heating systems, insulating exposed pipes, and keeping emergency kits in vehicles. Limiting time outdoors, especially overnight and early morning, will be critical if wind chills drop into dangerous ranges.
Cold-related advisories may be issued as confidence increases, with additional updates expected as the period approaches.
