NINO3.4 Index

  • index
  • 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

Sydney suffers in heatwave as NSW temperatures soar past 46 degrees Celsius

01:31 EDT

Temperatures at some regional sites in New South Wales have clicked over 46 degrees Celsius on Friday, with .

Early cyclones bring relief, and even a near-record soaking, to dry far north Queensland farmers

19:59 EDT

Two early cyclones in far north Queensland this summer have changed the fortunes of one of the country's most intensive farming areas.

Last night was Australia's hottest on record

15:51 EDT

The record for Australia's all-time highest overnight temperature was smashed last night, just one of the marks to fall in what is becoming a heatwave for the history books.