@wowc87
With the app on IPad that does not works. You must log in on desktop to connect to Windy website and change the units on the color scale at bottom right corner of your screen. Then your setting is applied to your iPad app.

https://community.windy.com/topic/13211/visibility-units-change/5

@dga223
I think you mean statute miles (1.609 km).
Nautical miles are already here.

@developers can add statute miles easily !