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. La Niña and El Niño events since 1900 are indicated on the graph.
Detailed event summaries: Past La Niña events, Past El Niño events

Timeline graph of ENSO and SOI index