December will likely be drier than November, so frost may be common at times. Except of course in outflow areas where mixing will keep lows well into the 40s.

My brother in Christ, please stop.

I get it, but it's kind of the regime we are in. January definitely has potential to deliver some goods though. And who knows maybe December comes in near average for some locations.

Glorious?

Jan 1963 was a lot colder than Jan 1979 for SEA. For some reason SEA was the master of underachievement on that one. Places just a few miles away in all directions were much colder. The Puget Sound region did have snow in Jan 1963 as well whereas 1979 did not. I would take 1949 over both.