Spectral Irradiance Data Download
  • In Situ calibrated
  • MLO calibrated
  • Historical Lamp calibrated
    • Weighted Irradiance Data Download
  • Erythemal
  • PAR
    • Derived Products Download
  • UV Index
  • Synthetic Spectra
  • Instantaneous Optical Depths
  • UV Irradiance Estimator
    • Climatology Products
  • Daily Sums
  • Hourly Sums
  • Spatio-Temporal Distribution of UV-B
  • US Merged Irradiance Statistics
  • Sums US Contour Maps
    • Instrument Characteristics Download
  • Filter Function Corrections
  • Angular Cosine Corrections
  • Langley Voltage Offsets
  • Serial Number Deployment History
  • Site Location Deployment History
    • Anciliary Measurements Download
  • Internal Head Temperature
  • Air Temp, Humidity, Reflective Solar Irradiance
  • Barometer
  • Electronic Offset(Bias)
  • Cosine Corrected Voltages
  • UVA (uncalibrated)
    • Quality Control Information
  • Data Processing Procedures
  • Data Corrections
  • Quality Control Abbreviations
    • Data Requests
  • Data Directory Access
  • Usage Statistics
    • Photosynthetically Active Radiation (PAR)
    Photosynthetically Active Radiation (PAR) irradiance is an irradiance in Watts per square meter over the 400 to 700 nanometer spectral range. It is measured with a separate PAR pyranometer sensor.

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

    Valid date range for location Alaska, Fairbanks, AK01, AK02 is from Tue Jun 24 22:09:00 GMT+00:00 2003 to Sat Jan 16 00:00:59 GMT+00:00 2021

    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
    • Oklahoma,Billings
    • Ontario,Toronto
    • Saskatchewan,Regina
    • 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
    • Louisiana,Baton Rouge,SU-Ag
    • Utah,Salt Lake City,UT21
    • Short Term Experimental Research Sites
    • Colorado,Fort Collins,CO22
    • Colorado,Nunn,CO04
    • Colorado,Nunn,CO06
    • Florida,Gainesville,Portable,FL99
    • Indiana,West Lafayette,Portable,IN99
    • New York,Geneva,Portable,NY99