You won't have any problem, where you are you might see 4 or 5 days of snow.
I used to sleep with the windows cracked and engine off during the winter when I was based out of Sumner and Tacoma. Winter over there is very mild.
ETA, I went through a winter over here in my YJ with the softtop and had no problem staying warm.
"But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." - Thomas Jefferson, Notes on the State of Virginia, 1782
Arguing with a truck driver is like wrestling with a pig in mud, eventually you realize the pig enjoys it.