As everyone else said, it’s a lot of little things:
[li]Some car engines don’t like to start when it’s cold. The solution is to install a block heater in your car and plug it in wherever you stop for long periods. Main street in Havre, MT has places to plug in, which you don’t find in Boca Raton.[/li][li]You get better clothes, and you get used to wearing the kinds of clothes you need to wear. As mentioned above, if your clothes are holding you back, you need better clothes. Which means you need a store with a good supply of such clothes. You don’t find that anyplace they grow oranges, but you do in Great Falls, MT.[/li][li]Driving and walking on ice is just experience. Knowing what a really badly iced walkway even looks like is experience, as is recognizing loose snow sitting on top of smooth ice. Northern people get in the habit of salting walkways and northern cities have the trucks needed to salt and gravel roads. I wouldn’t want to bet on the City of Miami being able to salt much more than a driveway. I also wouldn’t want to be on the roads in Miami if it ever needed to.[/li][li]Houses are built with different climate control systems. In the high desert of New Mexico where Deming is, a lot of places don’t have AC but do have swamp coolers. Older construction in Missoula, MT will frequently lack AC as well, but you can bet the houses here all have heaters, going back to the late 1800s. This, again, reflects a multi-decade process of people building to the climate.[/li][li]Speaking of buildings, a good number of them have a separate entryway area, so people can stomp snow off their boots before coming in. If you are entering a private residence, you might well be asked to remove your footwear down to your socks.[/li][/ul]
Go to a store that sells hunting supplies and general outdoorsy stuff and find something you like. Coveralls might be a bit much unless you’re doing seriously outdoorsy stuff, but boots, insulated pants, heavier shirts, gloves, hats (that cover the ears!), and a really good coat should all be available.
(It felt odd spelling that out. Of course hats cover the ears. Unless you’re somewhere where they don’t, I suppose.)
So, generally, we get by because of the culture around here which is adapted to the cold, and everything the culture has done in response to that cold.