Insolation Data Manual and Direct Normal Solar Radiation Data Manual

    Research output: NRELTechnical Report


    The purpose of this report is to provide average monthly data that depict the long-term geographic distribution of U.S. direct normal solar radiation - solar radiation incident on a surface perpendicular to the sun's rays. The Insolation Data Manual presents monthly averaged data which describes the availability of solar radiation at 248 National Weather Service (NWS) stations, principally in theUnited States.
    Original languageAmerican English
    Number of pages369
    StatePublished - 1990

    Bibliographical note

    Reprint of SP-755-789 and SP-281-1658 without modifications

    NREL Publication Number

    • NREL/TP-220-3880


    • solar
    • solar energy
    • solar radiation


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