Your best three options are as followed:
1. the rut;
2. the rut; and
3. the rut.
Personally, I'd pick anything between 15 Nov and 7 Dec. Snow fall usually puts a damper on things, but chances are you'll be hunting over bait with an outfitter so that shouldn't really be an issue. Sk isn't what it used to be and last year was by far my worst whitetail hunting year to date and the first time I didn't punch a whitetail tag in 15 years. I would definitely ask the outfitter how the herd is doing but know that trophy quality might suck donkeys.
Which outfitter are you looking at going with? (feel free to PM). Funny enough, headed back to my old stomping grounds this fall to hunt Eastern Townships whitetails!