Was -2°F here (Central Suffolk Co. NY) at 3:45 AM. Dry as a bone, crisp, hazy with blowing snow. I love it! It reminds me of younger days in St. Lawrence Co. NY. Only there, temp one morning was -47°F, four feet of snow with huge sand dune-like drifts. That's actual temp., none of this "real feel" wimpy nonsense! And yes, I carried an emergency kit in my car. Still do, although I have little need for it where I currently live.
The coldest I've seen and went out in (briefly!), -56°F, Depuyster, NY, 1981. At least that's what it read on the thermometer outside the barn. We actually brought a cow and her 12 hour old calf into an unused bedroom in the house, for fear they'd not survive the night. (Not recommended unless an emergency!)