"getting used to the cold weather"--What's the physiology?

Yes, here in Florida 40 degrees F feels much different from 40 degrees up north due to the humidity, and 40 degrees in the mountain west feels even more temperate. It’s rare to have what I’d consider a temperate day in Florida, which would be mid 50s to mid 60s with light wind, or low 70s with light wind depending on how active I’m going to be outside. Anything higher or lower and it is either too hot or too cold, both due to the humidity. Sometimes it’s both during the same day!

I once was in Vietnam for a talk and the university sent a student to pick me up. She spent the whole taxi ride snuffling and burrowing into her voluminous down overcoat. It was ~75F.

I’ve been in Newfoundland in the spring, and it felt colder to me than Saskatchewan in winter. Cold, wet wind blowing in from the north Atlantic will do that.

Also attended a Grey Cup in Vancouver and the indoor stadium felt colder than some outdoor Grey Cups I’ve attended, because at that time BC Place kept its roof up by air pressure - pumping cold damp air in for over three hours.

Aside from the seemingly infinite variables that comprise weather,

My mother freezes at 65* outside temp in her Southern California house but is comfy warm at 65* outside temp in our Rocky Mountains, newer house – basically, all other things being equal.

Our house is ridiculously well insulated and her house has none. Her ‘envelope’ is drafty; ours is quite tight. We also have more expensive, higher efficiency HVAC and whole-house humidification systems while she virtually has candles and a hot water bottle.

So even the indoor comfort has some very real variables that can make a big difference in comfort across different climates.

True. Ten years on, soldiers told me memories of what they called “The Big Dig”.