Solar data per county

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Hello,

Is it possible to download GHI averaged per county, rather than at the subcounty level it is plotted in NSRDB?

I'm looking to download the average GHI per county for all U.S. counties. It would be much easier if I can download the correct data than average it later after downloading the full dataset.

Best,
Titiaan
tpalazzi@rmi.org