Hacker News Reader

I think they do not make any forecast themselves, just aggregate sources: at least in 2018 since in wikipedia https://en.wikipedia.org/wiki/Ivo_Luka%C4%8Dovi%C4%8D I can read: "As of May 2018 it had a team of six employees, and 300,000 users visiting the site per day": pretty hard to imagine world forecast with only six employees :)

They're not doing their own weather predictions, they use different models. You can see them if you click compare for a specific location (Rouen, for example): https://www.windy.com/multimodel/49.44/1.09?temp,49.443,-0.5...

the list is scrollable

You can switch between different forecast sources (GFS/ICON/ECMWF etc)

In my part of the US, I find the GFS model is most accurate in the summer months and ECMWF does better in the winter. I haven’t really figured out which one works best in the transitional months.