Yorkville and Kendall County Sheriff's police aid a motorist who's car slid into a ditch at the intersection of Routes 71 and 126 in Yorkville Monday, January 21, 2013. | Steven Buyansky~Sun-Times Media
This dog sported a winter coat to cope with one of the coldest days of the year so far in Chicago on Monday, January 21, 2013 in Lincoln Park. | Al Podgorski~Chicago Sun-Times
With a wind chill advisory temperature of minus eleven degrees, a runner passes a water fountain in Lincoln Park on one of the coldest days of the year so far in Chicago on Monday, January 21,2013. | Al Podgorski~Chicago Sun-Times
With a wind chill advisory temperature of minus eleven degrees, people walked briskly along Milwaukee Avenue, on one of the coldest days of the year so far in Chicago on Monday, January 21,2013. | Al Podgorski~Chicago Sun-Times
With a wind chill advisory temperature of minus eleven degrees, people walked briskly along Milwaukee Avenue, on one of the coldest days of the year so far in Chicago on Monday, January 21,2013. | Al Podgorski~Chicago Sun-Times
The most frigid air mass the region has seen in two years has descended on the area. The National Weather Service forecasts that temperatures will be mostly in the single digits until Wednesday. With wind as a factor, temperatures Tuesday will be extra-chilly. A windchill …
