I can't remember the last time Chicago got all the way through October without a freezing day. This year, even by November 2nd, we still haven't officially had a freeze.
Also, tomorrow has Chicago's latest sunrise: 7:25 am. For those 33 years old and under, it's the latest sunrise ever. (During the 1973 energy crisis, Chicago didn't return to Standard Time in the fall.)
Delayed edit, 11:05pm: Moments after posting this, O'Hare recorded its first freezing temperature since April 16th.