It's so cold - how cold is it? - that:
-the nostrils freeze when you inhale
-the windshield wiper fluid won't come out
-60 percent of the city's automated, newly-privatized parking meter boxes don't work
The last is the number given by the The Parking Ticket Geek at The Expired Meter (this is a great website to know about if you drive in the Windy City and need to fight a ticket).
Read more about it here and here and here.