It may be time to buy weatherstripping, long underwear and logs for the fireplace.
While forecasts call for mild temperatures this week, the weather will change when Arctic air rolls southward next week, according to AccuWeather.com.
The weather service is saying cold air from Canada will spread south and southeast into the Western United states, then head eastward across the Plains toward the Chicago area and beyond.
Temperatures will not get as cold as the great arctic outbreaks of January 1994, December 1989 and January 1985, Accuweather said, but it's possible they could plummet 40 to 50 degrees in a one to two-day period.
The coldest weather around Chicago is likely during the second half of next week, when nighttime low temperatures may dip to near zero with a breeze stirring.
Alex Sosnowski, Expert Senior Meteorologist for AccuWeather.com