The official snowfall for Chicago as of 1 am was 2.5″ observed at Chicago O’Hare International Airport. This was the latest accumulating snow since 1989 (May 6).
The official snowfall for Rockford was 3.7″ observed at Chicago Rockford International Airport.
Thanks to Kenneth Lund and Ryan for this info
“They stopped updating higher snow totals at O’Hare almost 12 hours ago,” says Ryan. “It snowed quite a while longer than that and with the sun down might have accumulated more. Some snow further south into Iowa with this next system I don’t remember predicted.”