I pointed something similar with regard to thermometers to a group of European tourists. In Farenheidt, 98.6 is the normal temperature and if you are getting sick, people will say that 99 is a low-grade fever. While that is a. 4 degree difference in F, that's only a .2 difference in C.

Likewise for weather, F is much more precise and easier to communicate given that there is a smaller interval between units. There's more than 2 units difference in F for every 1 unit difference in C. That's huge when you're talking about the difference between 38 and 39 C