Just FYI, you can get free hourly (or 30/15 minute, I forget) cloud coverage data from the likes of EUMETSAT (and equivalent US/asian agencies).
Since then I also found Open Meteo (https://open-meteo.com/en/docs) to be a nice alternative for smaller projects.
Just FYI, you can get free hourly (or 30/15 minute, I forget) cloud coverage data from the likes of EUMETSAT (and equivalent US/asian agencies).