Today: Skies will vary from partly sunny to mostly cloudy; breezy and much colder. Highs in the mid to upper teens inland with low 20s from the city, south and in NW Indiana. Brisk NW winds between 10 to 20 mph will make it feel like it's in the single digits most of the day.
Tonight: Clear to partly cloudy and much colder. Lows -4º well inland, single digits most areas, but 0º at O'Hare would tie the record low. Not quite as cold in the city at 10º above. Wind: W/NW 6-12 mph sends wind chill values to-10º to -15º.
Thursday: Mostly sunny, continued bitter cold, but with less wind. Highs in the low to mid teens with below zero wind chills in the morning and single digits wind chills in the afternoon.
Friday: Partly sunny, breezy and not as cold in the afternoon. Highs in the upper 20s.
Saturday: Partly sunny, breezy and chilly. Highs in the mid to upper 30s.
Sunday: Partly sunny, breezy and chilly. Highs in mid to upper 30s.
Monday: Partly sunny, near seasonable temps with highs in the upper 30s to low 40s.
Tuesday: Partly sunny, breezy and even warmer. Highs in the upper 40s.
Thursday: Partly sunny, breezy and mild with above average temps continuing. Highs near 50º!