As an American I’m biased, but Fahrenheit matching the 1-100 scale used in so many other things just feels nice. Maps cleanly to 0-1.0 in a float/decimal type in programming which is neat too. Feels less arbitrary even if it actually isn’t.

I prefer metric otherwise but for temperature Fahrenheit just “clicks” in ways that Celsius doesn’t.

Fahrenheit doesn't match the 1-100 scale, though - Celsius does. 0 water freezes, 100 water boils.

Herr Fahrenheit measured the temperature many times over a period of one year in some town in Germany. He defined 0 degrees as the coldest measurement, 100 the hottest measurement.

Ok but Celsius works wherever you are (adjusting for pressure)

> some town in Germany

The Polish city of Gdańsk, of the then Polish-Lithuanian Commonwealth. He was also born there at the time. [1]

> He defined 0 degrees as the coldest measurement, 100 the hottest measurement.

Nope. It was neither about the temperatures in Gdańsk, nor about the temperature of his wife, btw. ;) [2]

  [1] https://en.wikipedia.org/wiki/Daniel_Gabriel_Fahrenheit
  [2] https://en.wikipedia.org/wiki/Fahrenheit

In what country do people encounter -40 degrees

Russia, canada, sweden, norway, finland, us... probably missing a few. Edit: mongolia too, I think.

curiously, nothing in the southern hemisphere?

Antarctica

We had a -40F windchill day here in Michigan a few years ago.

-40°C feels pretty much the same as -40°F

Because it is the same.

Parts of Canada for sure. When it’s below -35C my garage stored vehicle’s cold engine light turns after a bit on while driving!

Anytime your scale has to go into negative numbers to represent common scenarios, it's not human friendly.

If you're not tying your scale to human-specific temps, why not just use Kelvin? At least that won't go negative.