Its 2 am here in Wasilla Alaska, got up, was hungry, went outside to car in t shirt and just long thermal bottoms, with boots to get tablet out of car, temp was about 30f and never felt it.
Its all about acclimation to your climate, now if ypu put me in Orlando the next week or so when its over 75f I will get heat stroke, go figure.
Yes its unusually warm right now in Alaska, it was 41f above yesterday, snow is melting.
I read a great analogy of the polar weather last year ('Polar Vortex' these days). It was described as a yarmulke. It seems to always stay about the same size, but it doesn't always stay directly on top. It happens to be tipped down over Toronto about now.
Lived in Wasilla for a number of years tell the winters got so bad I had live in Seattle in the winter. The house was on the lake (Lake St.)next to the boat ramp. The lake would freeze with three feet of ice and people would drive on it and ice fish. Now live in Ga. were it was six degrees this morning. But the coldest place I ever lived was in Japan as it was a wet cold and wet snow.