The previous record low for this date was set in 1884. The Tribune:
National Weather Service officials said Saturday morning the temperatures at O'Hare were at minus 10 degrees, and they stayed below zero until 8 a.m. By noon, the temperature at O'Hare had risen to 17 degrees.
How about that. -10 the day before March begins. We're expecting about 3 inches of snow tonight and tomorrow. Manageable, but there's still about a foot on the ground in our neighborhood after snow on Wednesday, Thursday and a dusting again overnight.