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The Southern Oscillation Index (SOI) - Monthly
Calculated monthly (1887-1989 base period) SOI values from January 1876 to current. -
The Southern Oscillation Index (SOI) - Daily
Daily SOI and barometric pressure observations at Tahiti and Darwin, calculated using 1887-1989 and 1933-1992 base periods. -
SoE2017: Southern Oscillation Index
El Niño conditions prevailed in 2015 and at the start of 2016, followed by ENSO-neutral conditions for much of 2017. -
SoE2015: Southern Oscillation Index
A transition occurred, from a La Niña in early 2012 to a strong El Niño during the second half of 2015.