Anything below 0 may be cold, but y'all look at 20 and think "warm"? Really? How often do you need to know the boiling point of water in every day Life? Freaking never. And i get using celcius for science, but it just does not help for your average joe. and as you point out, it's much better to use Kelvin then anyway!
And your map is incorrect Vacant my friend, because there are still countries in Africa and Asia that use imperial. And don't sit up on that British high horse either! I know you people can't commit to either system of measurements! You just opted for a bastard child of the two!
And while we're there, y'all measure weight in increments of 14 pounds! That makes so much less sense than anything we use in America! At least base 12 is a thing! (And arguably better than base 10, if we could commit to it)