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

Perth hit by cold front, bringing snow to Stirling Range in south

15:31 EST

Western Australia's South West has been lashed by heavy rain and strong winds, with a cold front blanketing the mountain peaks of the Stirling Range in snow.

Western Australia rain, snow and frost

13:33 EST

A strong cold front delivered at least some rain to most central and southern districts of WA, except for Eucla, over the last 24 hours.

Quick change for Canberra

11:42 EST

You'd be forgiven for thinking that summer was making an early start in Canberra at the moment, but that's all about to change.