[l9k]

"The US is a big place" , but the world outside the US using Celsius is even bigger, more populated, and with more temperature differences.

Fahrenheit being more natural is purely subjective, there's no good reason at all for it.

Keeping the imperial system is just a matter of convinience because Americans are used to it and changing everything is difficult. Also some people think producers of food and any objects to sell might lose some margin by converting and rounding to the next round number of the new unit