Yes, you’re dressed for the weather, as I said. You wouldn’t go out in shorts and a t-shirt and stand there for hours. But if you have a good jacket, gloves, hat, boots, and maybe even snow pants, you can stay perfectly comfortable and safe in cold weather. My point was “cold” depends on what you’re used to.

Most security and construction jobs around here provide employees with big branded coats and winter hats for them to stay warm while they’re doing their jobs, I would assume it no different elsewhere.

That wouldn’t have helped this guy, though, since he died of a heart attack.

Any temperature below somewhere around 60F/15C is "deadly cold", as in your survivability depends entirely in how well you are clothed as you will eventually die of hypothermia otherwise, the only variable being how long it takes. Kinda like how you can get a 3rd degree burn with 44C water, it just takes 6 hours.

-12C really isn't all that cold - lowest temperature in northern Finland this winter so far has been -42,8C / -45F - but it is a temperature where you will need to pay some attention on how you dress for it. For me, it's around (-10 to 15c depending on the wind) where I'll put on long-johns in the morning and add a sweater instead of just having a t-shirt under my jacket.

It's really not bad. If you are in a survival mode then 10f is bad, but working on it is pretty normal.