When I went to the store this morning (and froze my butt off), the car's thermometer said it was -4 F outside. That's the lowest I've ever seen. It's also about 3 degrees optimistic, so that's just about right.
It's supposed to only get up to -3 F tomorrow. I'm staying inside.
Update (0653 29 Jan):I misread. The forecast low last night was -12. It stayed at -11 all night. The forecast low tonight was -17...except, now, it's -19.