UV Index is a measure of exposure to erythemally weighted irradiance. Basically, the erythemal irradiance in milliwatts per square meter is divided by 25 in order to provide a convenient index useful to the public. The number 25 is chosen because a typical clear sky, mid-day erythemal irradiance is about 250 milliwatts per square meter which results in a UV index of 10, which is simple to relate to potential for skin damage.
Graphs of the data are available for a time selection of two months or less. Also provided, is a feature to export the data to a file on your local computer in several different formats(excel, csv, xml).
Valid date range for location Alaska, Fairbanks, AK01 is from Sat Aug 26 00:00:00 GMT+00:00 2000 to Sat Sep 23 00:00:40 GMT+00:00 2017