Today was the 22nd day O’Hare has dipped below zero. The record number of sub-zero days is 25. That occurred way back in the winter of 1884-1885. This morning could be one of the last sub-zero mornings we see for several days. We will thaw out on Thursday to 32°, one of the warmest days we have seen in nearly two weeks. The bigger thaw will come next week. The 6 to 10 day outlook has more yellow, orange and red on it than blue for the first time in several weeks. The area shaded in yellow, orange and red is outlooked with a high probability of seeing above average temperatures for the third week of February. That includes all of the midwest and the majority of the country.
Take with a few grains of salt but the long-range forecast from the GFS model is hinting at 50° or more by Thursday of next week. Central and southern Illinois could see some 60s.