Ah someone already brought up the stretch of 89 after exit 10 lol. Honestly, as long as you go slow and plan ahead you should be fine. Sounds stupid but I saw someone almost slide off the road at about exit 8ish not an hour ago because a whole line of us slowed down to like 45 (Roads got icey real fast) and they passed everyone at only like 65-70 and just started fishtailing. Luckily they get smart and slowed down and got back in line. The moral of the story, if someone is going real slow on 89 in bad weather, think twice about your speed.

89 is better off than the smaller back roads though! 89 is usually salted and plowed first, so that's something.

EDIT: I seemed to recall something about more rain fall in the center of 89 and I found an rainfall map: https://media.cocorahs.org/images/Composite-NH-1100w.png 89 starts in a lower rainfall zone and ends in one while passing right through a heavier section. So more rain/snow right in the middle where people coming from either end are unprepared for it.