Statistics for occurrence #1 of “Chicago” in chapter 3.30, page 485 of Oliver Otis Howard, Autobiography of Oliver Otis Howard, major general , United States army : volume 2:
... knew nothing of these reasons when suddenly I received orders, near the close of 1880, to proceed to West Point, and as superintendent of the Military Academy take command there.
When we reached Chicago the cold was intense.
The thermometer registered thirty degrees below zero.
...