NOTICE (September 2017): Data previously stored at the CDIAC archive are being transitioned to the new, ESS-DIVE archive. This website provides access to the CDIAC data during the transition. If you have any questions regarding the new archive or the data 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