NOTICE (March 2018): This website provides access to the CDIAC archive data temporarily. It will be gradually transitioned into data packages in the new ESS-DIVE archive. This site will continue to operate in parallel during and after the transition, and will be retired at a future date. If you have any questions regarding the data or the transition, please contact

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CDIAC Climate Holdings Containing Sunshine Duration Data

Data Set Name Investigators Data Type/Format Period of Record
Historical Sunshine and Cloud Data in the United States (CDIAC NDP-021) P.M. Steurer and T.R. Karl Station data; monthly and annual sunshine duration (SD), max. possible SD, and percentage of possible SD Varies by station; as long as 1891-1987
Two Long-Term Instrumental Climatic Data Bases of the People's Republic of China (CDIAC NDP-039) S. Tao et al. Station data; monthly sunshine duration Varies by station; through 1993