We have to wait to get the cold air back. I know people had pointed to Monday the 12th for the return of cold air, but it doesn't look impressive. Now it looks like 40s next week which is above normal.
I think we probably have to wait until closer to the 20th for the return of significant cold air. As others have pointed out, we usually have a good part 2 to winter after a cold/snowy December. I'm optimistic that we'll get a good amount of snow in late January or February after this break from the cold air that we're going to see for a couple weeks.
Of course you never know, so we'll keep an eye on next week. We certainly can get lucky in a borderline situation in mid January.