Weighted Irradiance Data Download
Average Optical Depths
Average optical depths are total optical depths from Langley analyses that are derived over a period of a morning on which successful analysis was obtained. Each value is the slope of a regression of ln(voltage) on airmass, as described in Harrison and Michalsky (1994). Time periods included in the analyses are limited to specific airmass ranges which vary by wavelength: 1.5-3.0 for 332 and 368nm; 2.0-6.0 for 415-870nm.

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). Keep in mind a year's worth of data is about 25 megabytes, and will take almost 2 minutes to generate.

Valid date range for location Alaska, Fairbanks, AK01, AK02 is from Sat Aug 26 00:00:00 GMT+00:00 2000 to Sun Apr 30 15:36:43 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
  • Colorado,Nunn,Pawnee
  • Hawaii,Waimea,Mauna Loa,HI00
  • 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
  • Hawaii,Waimea,Mauna Loa,HI11
  • Hawaii,Waimea,Forrest Mims,HI21
  • Hawaii,Waimea,Forrest Mims,HI22
  • Hawaii,Waimea,Forrest Mims,HI31
  • 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
  • Louisiana,Baton Rouge,SU-Ag
  • Maryland,Greenbelt,NASA,MD21
  • Maryland,Greenbelt,NASA,MD22
  • Maryland,Greenbelt,NASA,MD23
  • Texas,Seguin,vis LED unit
  • 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
  • Colorado,Nunn,CO21
  • Colorado,Nunn,CO31
  • Colorado,Nunn,CO61
  • Colorado,Nunn,CO71
  • Colorado,Nunn,CO81
  • Florida,Gainesville,Portable,FL99
  • Greece,Thessaloniki,NASA
  • Indiana,West Lafayette,Portable,IN99
  • Maine,Howland,data by spcl request
  • Mexico,Mexico City,UTTEC T1,MX01
  • Mexico,Mexico City,2003,MX02
  • Mexico,Mexico City,UNAM CASA,MX03
  • Mexico,Mexico City,IMP T0,MX04
  • Mexico,Mexico City,UTTEC T1,MX05
  • Mississippi,Brooksville,vis-MFRSR only
  • Mississippi,Newton,vis-MFRSR only
  • Mississippi,Stoneville,vis-MFRSR only
  • New York,Geneva,Portable,NY99
  • Norway,Oesteraas,NO02
  • Norway,Oesteraas,NO03
  • Texas,Houston,LaPorte Airport
  • Texas,Houston,LaPorte Airport
  • UAE,Dhabi,NASA