Just saw this thread....here's my 2 cents....
I've traveled 395 many times, both starting from
Eastern WA (above Spokane) and Eastern OR (Bend area),
both summer & winter. You'll be taking a chance in
December - sometimes it's grand, other times, not so much.
Remember 395 goes right through Lakeview, OR - the mile
high city, and over Battle Mtn. Current web cam:
US395 at Battle Mountain, Oregon Road and Traffic Cam
May end up being a last might choice - better have plan B....and C.