O'Hare and Midway got down to 32, but 20s were fairly widespread in the northern and central LOT cwa. I had a low of 28. LOT kind of dropped the ball on this one imo, and it was already becoming apparent yesterday evening. Could've gone with a freeze warning.
Other low temps this morning:
Rockford: 27
Aurora: 28
Waukegan: 27
DuPage: 29
Wheeling: 30
Valparaiso: 29