Solar irradiance statistics (sunshine hitting the ground!)
So there's lots of information about the amount of sunlight reaching the upper atmosphere, but I'm drawing a blank on statistics relative to the amount of sunlight reaching the ground (through cloud cover) at a given weather reporting station for a given day. I'd like to find this information for anywhere near me so that I can compare year over year available sunlight for a given month so I can know if my output has declined because of aging or growth of additional vegetation. Any help in finding a resource for this info would be great.
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