For anyone else converting this to US format, here are a couple of notes:
I converted the preferences and openweathermap call to use zip instead of city and country
(maybe the app could pull lat-lon from the platform and use this by default?)
The temp conversion tips from @mhutchy above, obviously use * instead of x.
change all the C to F, change all the mm to in
set the input type for maxRain24 and rainForcastAllowed to be decimal instead of number to allow entering rainfall amounts like 0.5 inch
Edit: there are a few more changes needed, ill keep tidying it up and will post the US version here