Weighted Irradiance Data Download
UV Index
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 Fri Nov 24 00:00:12 GMT+00:00 2017

Location and Time User Inputs
  • Climatological Sites
  • Alaska,Fairbanks
  • Arizona,Flagstaff
  • California,Davis
  • California,Holtville
  • Colorado,Lamar
  • Colorado,Nunn,Pawnee
  • Colorado,Steamboat Springs
  • Florida,Homestead
  • Georgia,Griffin
  • Hawaii,Waimea,Mauna Loa
  • Illinois,Bondville
  • Indiana,West Lafayette
  • Louisiana,Baton Rouge
  • Maine,Presque Isle
  • Maryland,Beltsville
  • Maryland,Queenstown
  • Michigan,Pellston
  • Minnesota,Grand Rapids
  • Mississippi,Starkville
  • Montana,Poplar
  • Nebraska,Mead
  • New Mexico,Las Cruces
  • New York,Geneva
  • New Zealand,Alexandra
  • North Carolina,Raleigh
  • North Dakota,Fargo
  • Ohio,Oxford
  • Oklahoma,Billings
  • Ontario,Toronto
  • Saskatchewan,Regina
  • South Korea,Seoul,NASA,KOREA
  • Texas,El Paso
  • Texas,Houston
  • Texas,Panther Junction,Castolon site end 12-2014
  • Texas,Panther Junction,K-Bar site opened 12-2014
  • Texas,Seguin
  • Utah,Logan
  • Vermont,Burlington
  • Washington,Pullman
  • Wisconsin,Dancy
  • Long Term Research Sites
  • Hawaii,Waimea,Forrest Mims,HI21
  • Hawaii,Waimea,Forrest Mims,HI31
  • Hawaii,Waimea,Mauna Loa,HI11
  • Hawaii,Waimea,vis cal,HI41
  • Hawaii,Waimea,vis cal,HI51
  • Hawaii,Waimea,vis cal,HI61
  • Hawaii,Waimea,vis cal,HI71
  • Hawaii,Waimea,vis cal,HI81
  • Louisiana,Baton Rouge,SU-Ag
  • Maryland,Greenbelt,NASA,MD21
  • Texas,Seguin,vis LED unit
  • Short Term Experimental Research Sites
  • Colorado,Nunn,CO21
  • Colorado,Nunn,CO31
  • Colorado,Nunn,CO61
  • Colorado,Nunn,CO71
  • Colorado,Nunn,CO81
  • Maine,Howland,data by spcl request
  • Mexico,Mexico City,UTTEC T1,MX01
  • Mississippi,Brooksville,vis-MFRSR only
  • Mississippi,Newton,vis-MFRSR only
  • Mississippi,Stoneville,vis-MFRSR only
  • Texas,Houston,LaPorte Airport