Chicago faces a cold week with potential snowfall, including up to 6 inches from lake-effect snow by the week's end.

Data is from the National Weather Service’s Chicago office and measured at the city’s official recording site, which has been O’Hare International Airport since Jan. 17, 1980.

Drivers across the Chicago area Wednesday morning reported deteriorating road conditions as a snow squall warning was issued for some, with as gusty snow showers, "rapidly falling visibility" and ...