To reduce costs, they don't particularly encourage use outside Norway / Nordic countries.

Last time I read the API documents, they were only in Norwegian for this purpose.

Edit: it seems this is no longer the case; at least I can't find it on the site. But my Norwegian skills are practically non-existant.

English info on the yr.no data access api is here: https://hjelp.yr.no/hc/en-us/categories/200450271-About-Yr-t...

This data is provided by the Norwegian meteorological institute: https://www.met.no/en/free-meteorological-data

There is also a private Norwegian weather provider, StormGeo: https://www.stormgeo.com/

You could also implement a cheap mirror of the data, I guess... So that is no excuse

So are they paying for the data from the US and other countries? Or relying on free data online?