The normal high temperature in Chicago on November 2nd is 12°C, which we aleady hit between 7 and 8 am today. Yesterday Chicago got to 22°C at O'Hare and 23°C at Midway, with similar temperatures expected to continue through Thursday.
These temperatures make more sense mid-September than at the beginning of November. But we'll take them anyway. Temperatures will go back to normal Friday and Saturday, with frost expected Saturday night.