I think that for the accumulated price tag of the parts you're shopping, I'd rather have a 3-season drop bar fender bike with all the nice parts and a crude flat bar studded-tire winter bike. Hey, looks like Clifford already said that.
Some bike hydraulic brakes use DOT fluid and some (notably for this thread, Shimano) use mineral oil, you want the former for bitter cold and the latter for just about any other reason
Month High / Low(°F) Rain
December 30° / 18° 13 days
January 24° / 11° 11 days
February 26° / 12° 10 days
March 35° / 21° 11 days
April 49° / 34° 10 days
May 63° / 46° 10 days
June 75° / 58° 10 days
July 80° / 64° 10 days
August 78° / 62° 9 days
September 71° / 55° 9 days
October 56° / 43° 10 days
November 44° / 32° 10 days