System details: Beijing Climate Center, China Numerical, Empirical or Hybrid Numerical Deterministic or Probabilistic Probabilistic and Deterministic both Model type and resolution Coupled ocean-atmosphere GCM (coupled by NMC-MWF AGCM model (T63L16) and IAP/LASG OGCM model (T63L30) based on Daily Flux Anomaly Coupling method. Atmospheric component: 16 vertical levels; horizontal resolution of 1.875กใ east-west and 1.875กใ north-south. Oceanic component: 30 vertical levels; horizontal resolution of 1.875กใ east-west and 1.875กใ north-south. Ensemble size 48 members for forecasts and hindcasts Parameters assessed 2m temperature, precipitation and sea surface temperature Regions Global Lead times 1,2,3-months Period of verification 3-month rolling seasons corresponding to months 2-4, 3-5, 4-6 Number of hindcasts and the dates/years of these hindcasts 19 years (1983-2001) Verification data sets 2m temperature: ERA40 Reanalysis data set Precipitation : Precipitation : CMAP observations dataset. SST: Reynolds SST dataset provided by the Lead Centre. . Further details can be found at: http://bcc.cma.gov.cn/en/ http://bcc.cma.gov.cn/CSMD/Website/index.php?WCHID=3