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1979 weather data was collected by the National Weather Service in International Falls, Minnesota, and is considered representative of the Superior National Forest area. Total solar insolation measurements were made at Fall Lake Dam in Winton, Minnesota, using a Yellow Springs solar cell calibrated against an Eppley Pyranometer. The dataset is hosted by NASA and appears on multiple government data platforms.
License is unclear ('other-license-specified' vs. 'None'). The 2026 update date on Data.gov may be a metadata error, as the data itself is from 1979. Available file formats include HTML, PDF, PNG, BIN, ISO, ZIP, and TEXT.