Yesterday's temperature at O'Hare did tie the previous O'Hare records of 16.1°C. Midway also broke a record, topping off at he same temperature. And the official low temperature also tied the warmest for the date, 6.1°C, set in 1886.
That said, while Midway was (1930s to 1958) and O'Hare now is (since 1958) the official weather station for Chicago, neither matched the 17.1°C record set in 1876—at a weather station that doesn't even exist any more.
Whatever. Yesterday's weather was just fine anyway.
We now return to our regularly-scheduled winter.