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NINO3.4 Index

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  • SOI
  • NINO3.4

The NINO3.4 index is one of several El Niño/Southern Oscillation (ENSO) indicators based on sea surface temperatures.

NINO3.4 is the average sea surface temperature anomaly in the region bounded by 5°N to 5°S, from 170°W to 120°W. This region has large variability on El Niño time scales, and is close to the region where changes in local sea-surface temperature are important for shifting the large region of rainfall typically located in the far western Pacific.

An El Niño or La Niña event is identified if the 5-month running-average of the NINO3.4 index exceeds +0.4°C for El Niño or -0.4°C for La Niña for at least 6 consecutive months.

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Weather News

Severe and 'unusual' summer weather forces cancellation of music and Christmas events

22:38 EDT

Major Perth events, including Carols by Candlelight and A Day on the Green, have been cancelled as a severe and unseasonal storm approaches the city.

A week of two halves for Tasmania

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It will be one of those weeks where Tasmanians will need sunnies and a hat, followed by a jumper and umbrella.

Extreme heatwave heads to outback towns in Queensland, NSW

11:37 EDT

There will be extreme heatwave conditions in south-west Queensland and north-west New South Wales over the next three days, the Bureau of Meteorology (BOM) says, with several outback towns expecting sweltering daytime temperatures of at least 43 degrees Celsius.