A Wind Chill Advisory is in effect for Cook, DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall, LaSalle, Lake (Ill.), McHenry and Will counties until 10 a.m. Friday.
Wind chills will reach as low as -20, which the National Weather Service says can cause frostbite on exposed skin in as little as 30 minutes.
The weather has led to a few schools in the area to be closed Friday. For a full list, click here.
The bitter cold comes after another round of snow, with some places getting as much as five inches of snow.
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Friday will be sunny and temperatures will warm up over the weekend.
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Source: ABC7 Chicago