Wow! Y'all are some rugged people who live back there!
(But I do envy you your white Christmas'.) :-)
Well, it starts "spitting" snow in November, but it is touch and go for a white Christmas. It usually doesn't let us down, but sometimes it's a real close call.
The worst part of winter starts in January through April. We have even had snow storms on Mother's Day. It's real hard for Maine to get into spring. But keep in mind, I am at the TOP of Maine. Down around Bangor and the coast, their winters aren't near as hard.