Well, yup!! You sure as heck can't ice dive in Texas, or really anywhere else in the Northern Hemisphere, south of of about I-80. (maybe in the mountains)
I mean people do all kinds of weird things. Like travel hundreds of miles to places colder than where they live and then strap to boards to their feet so that they can go hurling down a mountain. There is a whole industry built around this kind of odd behavior. (oh! my!!)
I grew up in the upper midwest where cold weather can be extreme and is taken very seriously cause it can kill you. (we went ice diving with outside temps of -17F and -50F windchill, we were inside of a heated hut where temp was 19F) If you don't learn how to deal with the cold, you would never leave your house for weeks on end. Winter sports become part of your lifestyle and to the folks that live there, ice diving is a bit extreme, but not not that extreme.
I did my original training in Green Bay, once we got done diving for the day, we fired up the grill (on the ice), cooked bratwurst and drank beer for a while. Those Wisconsin boys didn't think too much of the cold. (of course it was in the 20's and no wind, wasn't that cold)