The only countries that officially use Fahrenheit instead of the world standard Celsius as a unit for measuring temperature is the United States,  Liberia and the Cayman Islands.
Why? Because we are are used to it?

But also because you can't find many computer/phone apps the will show both F/C at the same time.  If we saw both temps every time we look at the weather we would get used to Celsius.

Let's help transition the few renaming counties to the world standard, by writing all future and current weather apps to show both Fahrenheit and Celsius at the same time..

For example :

21C/70F preferred

70F/21C (optional)

could be changed by settings..

Please give ideas.. and request your favorite Weather apps to support this.