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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

Rain drenches Perth but fails to bring many desperate WA farmers relief

16:51 EST

A cold front over the southern half of Western Australia has dumped more than 60 millimetres of rain on Perth, and has given some struggling farmers a boost, but has failed to reach all agricultural areas desperate for a drenching.

Remembering the great Hawkesbury flood tragedy of 1867

11:21 EST

It is a strange experience for Carol Pohahau as she steps on to the land where her ancestors once lived.

Western soaking targets Perth

11:15 EST

Perth has just received its heaviest June rain in more than 30 years amid a wet end to the week in Western Australia.