The National Weather Service has issued a wind chill advisory from 6 p.m. Wednesday until 10 a.m. Thursday. It warned that temperatures will fall into the single digits this afternoon and below zero this evening. Winds chills could be down to 10 to 20 below zero this afternoon and 15 to 30 below zero tonight.
Since Dec. 5, temperatures have been 14 to 16 degrees below average. Early Tuesday, it registered minus-6 degrees at O’Hare International Airport. That’s the earlier subzero temperature in Chicago since minus-4 was recorded at O’Hare on Dec. 9, 1995. It was also the coldest temperature in the first 10 days of December since minus-8 degrees on Dec. 10, 1978.