This recent movie of the European Long Range forecast model tells the story into the first week of December as to why we are still going to feel colder temperatures. Notice the wave-like nature of the winds aloft in the video below. This would allow some milder days with a trend to colder temps into the heart of December. The stronger/flatter these troughs in the wind aloft in the middle/eastern half of the US, the longer the colder periods. We didn't have this type of aggressive troughiness in the east last year.
...something to watch as it develops!