NSRDB 1961-1990: Hourly Data Files

The Hourly Data Files are derived from the National Solar Radiation Data Base hourly data in synoptic format. They contain global horizontal solar irradiance, direct normal solar irradiance, and diffuse horizontal solar irradiance for each hour from January 1, 1961 through December 31, 1990 (if available) for each of the 239 sites in the NSRDB. See the National Solar Radiation Data Base User's Manual for a complete description of the NSRDB.

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