NOTICE (July 2017): CDIAC will cease operations on September 30, 2017. Data will continue to be available through this portal until that time. A new DOE data archive is now at Lawrence Berkeley National Laboratory and is named ESS-DIVE. Data stored at CDIAC is being transitioned to ESS-DIVE and will be available from ESS-DIVE by September 30, 2017. 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