Monthly and Weekly Nino 3.4 Region SST Index: East Central Tropical Pacific

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Abstract: [Text Source: NOAA/CPC and NOAA/ESRL/PSD]

Nino Regions - for data sampling of SSTs the tropical Pacific has been divided into a number of regions named Nino 1, 2,3, 4, and 3.4 (which is encompasses part of both region 3 and 4). Nino 1 is the area defined by 80W-90W and 5S-10S, Nino 2 by 80W-90W and 0S-5S, Nino 3 by 90W-150W and 5N-5S, Nino 4 by 150W-160E and 5N-5S, Nino 3.4 by 120W-170W and 5N-5S. (see:

The Climate Prediction Center has weekly data since 1990 and monthly since 1950. The Climate Diagnostics Center has monthly Nino 3.4 since 1948.

NCAR has Nino 3.4 data from Trenberth since 1871. (
Related URL
Description: Access to monthly Nino 3.4 SST index data since 1948
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Geographic Coverage
Spatial coordinates   
  N: 5.0   S: -5.0   E: -120.0   W: -170.0

Data Set Citation
Dataset Originator/Creator: NOAA/NWS/CPC
Dataset Title: Nino 3.4
Dataset Series Name: NOAA/NWS/CPC Indices and Forecasts
Dataset Release Date: ongoing
Dataset Release Place: Camp Springs, MD
Dataset Publisher: NOAA National Weather Service, Center for Climate Prediction
Online Resource:
Temporal Coverage
Start Date: 1948-01-01
Data Resolution
Temporal Resolution: monthly, weekly
Temporal Resolution Range: Weekly - < Monthly
Data Set Progress
Originating Center
Data Center
Climate Prediction Center, National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce Supplemental Info
Data Center URL:
Dataset ID: Weekly Nino 3.4 SST index data since 1990

Data Center Personnel
Email: Ed.Olenic at
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Distribution Media: online www
Distribution Format: ascii
Fees: none
Email: Ed.Olenic at
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Trenberth, K. E. (1997) The Definition of El Nino. Bulletin of the
American Meteorological Society, 78, 2771-2777.

Trenberth, K. E. (1996) El Nino Definition, Exchanges, Newsletter of
the Climate Variability and Predictability Programme (CLIVAR), Volume
1, No.3, 6-8.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2005-12-13
Last DIF Revision Date: 2009-11-05
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