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If your coordinate is in North America, the Daymet dataset https://daymet.ornl.gov/ provides gridded estimates of shortwave radiation; defined as: Incident shortwave radiation flux density in watts per square meter, taken as an average over the daylight period of the day for the time period 1980 - present. A single location can be extracted as a csv file from the dataset using the Single Pixel Extraction Tool https://daymet.ornl.gov/single-pixel/ .
ORNL NASA Distributed Active Archive Center
Oak Ridge National Laboratory firstname.lastname@example.org