I grew up in CO above 8000 ft. I have hunted deer and elk when it was colder than -20. I have been ice fishing when it was -30. When you spend 7 or 8 months a year with snow on the ground you tend to get used to that sort of thing
I grew up in this area of Northern Alberta.
You are right, a person does get used to the cold. But that doesn't mean we are any better at surviving the cold.
I lost a brother to hypothermia. And I've been too close to succumbing to it myself. Never take the cold for granted.
We get spells where the mercury never tops -30 for days. Some times for a week or more.
And we almost always get a few days of -40 or colder each winter. -60 is not uncommon here.
When you get a spell like that and you have livestock you have no choice but to get out and work in that cold, And it doesn't feel that bad.
But you have to respect the cold.
Make one mistake at those temperatures and it could be your last.
Ways to survive the cold.
Stay out of the wind as much as possible.
Wear wool if possible. Wool insulates even when wet.
Keep moving.
Don't eat snow, especially yellow snow.
Never stop for more then a few minutes without building a fire.
Never wear rubber.
Carry a lunch, you will burn a lot of calories and you need to replace them,.
Carry a chocolate bar, If you play out it'll give you a quick boost of energy.
Wear layers. Don't get over heated. Sweat can kill you quick.
But the best advice is to stay inside when possible.