On this page: Temporal Coverage | Spatial Coverage | Levels | Update Schedule | Download/Plot Data | Analysis Tools
Restrictions | Details | Caveats | File Naming | Citation | References | Original Source | Contact


From the JRA webpage: "Since some satellite data had been used incorrectly to estimate SSTs in sea ice areas, monthly mean SST data from January 2006 to December 2009 and SST normals were replaced with re-calculated ones. Please download the data again, if you obtained them previously."

Temporal Coverage:

  • Monthly Means: 1891/01 near present.
  • Long Term Mean: 1981-2010.

Spatial Coverage:

  • 1.0 degree latitude x 1.0 degree longitude global grid (360x180).
  • 89.5N - 89.5S, 0.5E - 359.5E.


  • Sea Level

Update Schedule:

  • Monthly

Download/Plot Data: (FTP Access)

Variable Statistic Level Download File Create Plot/Subset
SST Monthly Mean Surface sst.mon.mean.nc plot
SST Climatology Surface sst.mon.ltm.1981-2010.nc plot

Usage Restrictions:

  • None

Detailed Description:

  • The COBE-SST dataset is used as input for the JMA Climate Data Assimilation System (JCDAS) and the Japanese 25-year Re-analyses (JRA-25 and JRA-55). It is also used as input for the ensemble prediction systems used in seasonal forecasts. See the JRA COBE-SST webpage for details.


  • None

Related File Naming & Structure Information:

File Names:

  • var.time.stat.nc   (In directory: /Datasets/COBE/)

Dataset Format and Size:

    Dataset format and size:
  • PSL standard NetCDF 380 Mbyte file for monthly file. /Datasets/COBE/sst.mon.mean.nc
  • PSL standard NetCDF 3.1 Mbyte file for long term monthly mean file: /Datasets/COBE/sst.mon.ltm.1981-2010.nc

Missing Data:

  • Missing grids are 1e20.
  • Missing grids are 9.999e+20 (ltm).


  • Please note: If you acquire COBE SST data products from PSL, we ask that you acknowledge us in your use of the data. This may be done by including text such as COBE SST data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at / in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSL to justify keeping the COBE SST data set freely available online in the future. Thank you!
  • Ishii et al. (2005) (see below)


  • Folland, C. K. and D. E. Parker, 1995: Correction of instrumental biases in historical sea surface temperature data. Q. J. R. Meteorol. Soc., 121, 319-367.
  • Ishii, M., A. Shouji, S. Sugimoto, and T. Matsumoto, 2005: Objective Analyses of Sea-Surface Temperature and Marine Meteorological Variables for the 20th Century using ICOADS and the Kobe Collection. Int. J. Climatol., 25, 865-879.
  • Japan Meteorological Agency, 2006: Characteristics of Global Sea Surface Temperature Analysis Data (COBE-SST) for Climate Use. Monthly Report on Climate System Separated Volume, 12, 116pp.

Original Source:


  • Physical Sciences Laboratory: Data Management
    325 Broadway
    Boulder, CO 80305-3328