I saw this fancy cloud cover instrument, which is more expensive than I can justify:
https://diffractionlimited.com/product/boltwood-cloud-sensor-ii/Just watching my solar plots on a daily basis, got me to wondering if there was some way to compare a "clear sky" day based on historical data and determine roughly the cloud cover. I am thinking something very basic like "clear", "partly cloudy" and "overcast".
For example, this recent chart shows a clear day the first day, followed by partly cloudy days.
Maybe the database work it too complex. This is beyond my programming skills, but I was wondering if anyone had attempted something like this.
Greg H.