Australian climate influences timeline
El Niño and La Niña events

Timeline of monthly Southern Oscillation Index (SOI) values since 1876

Sustained negative values (bottom/yellow) of the SOI below −7 may indicate El Niño, while sustained positive values above +7 may indicate La Niña.
Detailed event summaries: Past La Niña events, Past El Niño events

Timeline graph of ENSO and SOI index

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