Solar Insolation Ranges

[Metadata] Estimated Daily Solar Insulation polygons, in calories/sq.cm/day. Source: State Dept, of Planning and Economic Development, Energy Division "Sunshine Maps," 1985. 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. The sunshine maps should not be used for sizing PV arrays; map users are advised to seek additional data on sun-hours per day. The boundaries depicted in these maps are approximate only. Apr. 2024: Hawaii Statewide GIS Program staff removed extraneous fields that had been added as part of the 2016 GIS database conversion and were no longer needed. For more information, see metadata at https://files.hawaii.gov/dbedt/op/gis/data/solrad.pdf or contact Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, Hi. 96804; [phone]; email: [e-mail]; Website: https://planning.hawaii.gov/gis.