I don't want to sound like an old curmudgeon but you are correct about historically seeing those temps. I remember growing up that Canaan, VT was somewhat regularly the coldest reading in the lower 48. -20 was a pretty regular occurrence and -30 was not uncommon. It's a few years since I've seen -20 here. Having said that, I have an outdoor event Sunday so I wouldn't mind it moderating a bit.