The Chicago area will see below-average temperatures on Sunday, but clearing skies will pave the way for some downright frigid readings overnight.
As a result, the National Weather Service has issued a freeze warning for the entire Chicago area, with low temperatures plunging into the mid-to-upper 20s in areas away from Lake Michigan.
Those temperatures could harm or kill sensitive outdoor plants, and could damage unprotected outdoor plumbing, according to officials…