TNI (Trans-Niño Index) and N3.4 (Niño 3.4 Index)
http://www.cgd.ucar.edu/cas/catalog/cli ... index.html
Japanese Meteorological Agency ENSO
ftp://www.coaps.fsu.edu/pub/JMA_SST_Ind ... y.filter-5
El Nino Data Before 1950 Data
- Ptarmigan
- Statistical Specialist

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