Name
Description
Estimated Daily Solar Insolation, in ranges of 50 calories/sq.cm./day (A higher solar insulation number means more sun exposure). These maps are based on extrapolation of a limited number of data points and should be used as a general first-cut illustration of irradiance. They were originally intended to simply distinguish between “sunny” areas and “cloudy” areas.
Source
State Department of Planning and Economic Development, Energy Division “Sunshine Maps”, 1985. https://files.hawaii.gov/dbedt/op/gis/data/solrad.pdf
Link to download data from source