This is awesome. I was trying to do a weather project a while ago, but couldn't find an API to suit my needs for the life of me. It looks like yours still doesn't have exactly everything I'd want but it still has plenty. Mainly UV index is something I've been trying to find wide historical data for, but it seems like it just might not be out there. I do see you have solar radiation, so I wonder if I could calculate it using that data. But I believe UV index also takes into account things like local air pollution and ozone forecast as well.