I can tell when it gets below minus 20, because the cold water pipe to my bathtub freezes. I turn on the tap and nothing comes out. It used to freeze around zero when we first moved in here, but we took off some clapboards and sheathing and put in some insulation, so things are a little better.
Fortunately the plumber used plastic for that length of pipe, so it freezes and thaws without bursting.
If Alaska is getting the artic air now, I imagine it will start moving east sometime later this winter.
It may sound amazing, but even at -50 to -60 our plumbing doesn't freeze. That's because we built our log home with ALL plumbing on interior walls, and even our well has a drainback system. The propane used to stop flowing at brutal cold temps, but that was cured with an insulated box, burying the line deeper, and heat tape if we're real desperate. LOL
I hope this spell doesn't swoop down on your area. But if it does, you obviously know how to survive it. :)