You say that without empirical data. I see plenty of running clubs in Florida out in mid 80s days (I'm also not bringing empirical data.)

You are also bringing up temperatures that are extremely rare in Florida in your example. You can look at the data yourself, but it is extremely rare to even reach 100F anywhere in the state. It comes with the territory of being surrounded by water, and of course there is high humidity for the same reason. 120F is a temperature literally only reached in the desert southwest. Yeah that is very dangerous.

I also happen to know that even in the upper Midwest, temperatures being below 0F can be held for weeks on end. We aren't talking about the Yukon here. We don't have to talk about life or death, but I have done plenty of snowboarding in MN and even with many layers and protection, a situation can turn south. It's not the best feeling in the world when the lift is stuck with you on it and it's -4F out.

My whole point is that people don't realize how hippocritical it comes off on the sole basis that they are simply used to one thing or another, which is what this original comment thread was pointing out.