What Was the Official Low Temperature in Chicago? Just Before 7 AM -2.9°F at O’Hare

 3.9 °F at 12:51 AM ABOVE ZERO
 3.0 °F at 01:51 AM BELOW ZERO 
 1.0 °F at 02:51 AM BELOW ZERO  
-0.0 °F at 03:51 AM ZERO  
-2.0 °F at 04:51 AM ABOVE ZERO 
-2.0 °F at 05:51 AM ABOVE ZERO
-2.9 °F at 06:51 AM ABOVE ZERO

Today: Increasing clouds and cold, with a high near 10. Wind chill values as low as -22. West northwest wind between 5 and 10 mph, with gusts as high as 15 mph.

Tonight: A 40 percent chance of snow. Cloudy, with a temperature falling to near 5 by 9pm, then rising to around 13 during the remainder of the night. Wind chill values as low as -4. West southwest wind around 5 mph.

Saturday: Scattered flurries. Cloudy, with a high near 19. Southwest wind 5 to 10 mph becoming northwest. Winds could gust as high as 15 mph.

See also …
Weather Underground January 20, 2011 …
Weather Underground January 20, 1985 (All-time record cold to date) …