Chicago is indeed still sitting under 6" of snow through January 15th. Average seasonal snowfall is 36.3", a target which might as well be a million miles away at the rate things have been going. By average snowfall, I mean first flake to last flake average, not just DJF.
Don't hold me to it, but if I had to take a wild guess, I'd say ORD finishes between 25-30". Even that would feel like a monster rally given the dearth of snow so far.