Trivia: The last time it was this cold on my commute to work was February 18th.
When cold fronts move across Chicago in November, we get slammed. Saturday's daily maximum at Chicago O'Hare was 18.3°C (66°F), and the daily minimum Monday morning was -2.2°C (28°F). In Chicago, this constitutes a gradual decline.
Yesterday, the heat gave up and went to Miami, leaving us, this morning, shivering our timbers at -13.3°C (8°F), which even I call cold.
At least the sun is out.
Keep your eye on Chicago weather and the the view out Inner Drive's office window to understand my pain.
 -9.4°C (15°F); in February it was -11.6°C (11°F).