Weighted Irradiance Data Download
Hourly Sums

Hourly sum values represent an integration over time. Basically by summing the readings over the number of seconds in the measurement period, the units of radiant power are converted to radiant energy and are useful for studying daily effects related to daily exposure. Current available values are Caldwell biological spectral weighting function, Flint biological spectral weighting function, erythemally weighted irradiance, UV-A irradiance, and UV-B irradiance. To insure quality data, the In Situ calibrated data is available through the previous month.

Please note we now have an FTP Access, to download site/sites, year/years of data.

The hourly sums are processed monthly. The current month's data will be available at the beginning of the next month.

Valid date range for location Alaska, Fairbanks, AK02 is from Sat Aug 26 00:00:00 GMT+00:00 2000 to Wed May 31 12:26:56 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
  • Colorado,Longmont,Perm.Reference,CO97
  • Colorado,Longmont,Table Mountain,CO99
  • Hawaii,Waimea,Forrest Mims,HI22
  • Hawaii,Waimea,Mauna Loa,HI03
  • Hawaii,Waimea,Mauna Loa,HI04,ref
  • Hawaii,Waimea,Mauna Loa,HI05
  • Hawaii,Waimea,Mauna Loa,HI06
  • Hawaii,Waimea,Mauna Loa,HI07
  • Hawaii,Waimea,Mauna Loa,HI08
  • Hawaii,Waimea,Mauna Loa,HI09
  • Louisiana,Baton Rouge,SU-Ag
  • Maryland,Greenbelt,NASA,MD22
  • Maryland,Greenbelt,NASA,MD23
  • Short Term Experimental Research Sites
  • Arizona,Tucson,UV-MFRSR only
  • Bolivia,Santa Cruz,NASA MD22 in Bolivia
  • California,Mt. Wilson,SCOS-97
  • California,Mt. Wilson,SCOS-97
  • California,Pasadena,NASA
  • California,Riverside,SCOS-97
  • China,Xianghe,NASA
  • Colorado,Fort Collins,CO22
  • Colorado,Fort Collins,CO23
  • Colorado,Fort Collins,CO24
  • Colorado,Longmont,Table Mountain,CO94
  • Colorado,Longmont,Table Mountain,CO95
  • Colorado,Nunn,CO03
  • Colorado,Nunn,CO04
  • Colorado,Nunn,CO05
  • Colorado,Nunn,CO06
  • Colorado,Nunn,CO07
  • Colorado,Nunn,CO09
  • Florida,Gainesville,Portable,FL99
  • Greece,Thessaloniki,NASA
  • Indiana,West Lafayette,Portable,IN99
  • Mexico,Mexico City,2003,MX02
  • Mexico,Mexico City,IMP T0,MX04
  • Mexico,Mexico City,UNAM CASA,MX03
  • Mexico,Mexico City,UTTEC T1,MX05
  • New York,Geneva,Portable,NY99
  • Norway,Oesteraas,NO02
  • Norway,Oesteraas,NO03
  • Texas,Houston,LaPorte Airport
  • UAE,Dhabi,NASA