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

Driving in heatwaves: Why the temperature on your car dashboard is different to BOM

07:20 EDT

Most Australians know the feeling of opening the car door after it has been parked in the sun on a hot day, and the rush of heat that smacks you in the face.

High temperatures and increased fire danger forecast for all of Victoria until Sunday

05:21 EDT

A heatwave moving towards Victoria from Western Australia will see temperatures rise across the state ahead of increasing fire danger on Friday.

Flooding rain continues in Queensland

14:22 EDT

Rain and thunderstorms have continued to soak northern Queensland during the last 24 hours, with central Australia next in line.