> What's a more convenient scale for human living conditions? 0–100 °F or -20–40 °C? I am aware people live in even colder and hotter environments, but the majority of people in the world don't need to worry about values outside of this range. I also think "0 is very cold" and "100 is very hot" just makes more sense than "-20 is very cold" and "40 is very hot".

The idea that 0-100F is somehow the range of “human living conditions” is completely bizarre to me, but I can see why someone from a place like the American Midwest might think this is true.

To me 0C is so much more meaningful than 0F, especially when talking about weather. The difference between -1C and 1C is something you can literally see around you. The difference between -1F and 1F is not.

Anything “below zero” is literally frozen and completely inhospitable to normal human life!