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Download: Observations

The following observation datasets are available.
  • ENSO Indices: monthly NINO1+2, NINO3, NINO3.4 and NINO4 area-averaged sea-surface temperatures (SSTs) from 1856 to date using the Kaplan extended SST data. The data are typically updated towards the end of the first week of each month. The areas are:
    • NINO1+2: 0-10S, 90W-80W
    • NINO3: 5N-5S, 150W-90W
    • NINO3.4: 5N-5S, 170W-120W
    • NINO4: 5N-5S, 160E-150W
  • SST: monthly 2- by 2-degree SSTs from 1854 (for most analyses it is not recommended to use data prior to about 1950) to date from the Extended Reconstructed Sea-Surface Temperature dataset; version 4 of the dataset is accessed in CPT15.2 and later versions. Version 3b was accessed in earlier versions of CPT. If you want to download version 3b instead of version 4, then the URL that CPT generates can be changed simply to "version3b" in the appropriate section. The data are typically updated towards the end of the first week of each month. This dataset does not require a password.
  • Maximum Temperature: monthly 0.5- by 0.5-degree maximum air temperatures over land from 1901 to 2013 from the University of East Anglia Climate Research Unit gridded station dataset. Version 3.22 of the dataset is accessed in CPT15.2 and later versions; version 3.21 was accessed in earlier versions of CPT. This dataset is password protected. See information on getting permission for further details.
  • Minimum Temperature: monthly 0.5- by 0.5-degree minimum air temperatures over land from 1901 to 2013 from the University of East Anglia Climate Research Unit gridded station dataset. Version 3.22 of the dataset is accessed in CPT15.2 and later versions; version 3.21 was accessed in earlier versions of CPT. This dataset is password protected. See information on getting permission for further details.
  • Mean Temperature: monthly 0.5- by 0.5-degree mean air temperatures over land from 1901 to 2013 from the University of East Anglia Climate Research Unit gridded station dataset. Version 3.22 of the dataset is accessed in CPT15.2 and later versions; version 3.21 was accessed in earlier versions of CPT. This dataset is password protected. See information on getting permission for further details.
  • Precipitation: monthly 0.5- by 0.5-degree wet-days over land from 1901. Two datasets are available:
  • Wet-days: monthly 0.5- by 0.5-degree wet-days over land from 1901 to 2013 from the University of East Anglia Climate Research Unit gridded station dataset. Version 3.22 of the dataset is accessed in CPT15.2 and later versions; version 3.21 was accessed in earlier versions of CPT. This dataset is password protected. See information on getting permission for further details.

 
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