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

Quick change for Canberra

14:37 EST

After an almost summer like day yesterday, Canberra is feeling the cold today, with conditions set to get even colder next week.

Cold and dry winds for Sydney

12:10 EST

A strong front will introduce a much colder and drier airmass across the Harbour City on Monday.

Chilly mornings on the horizon for Brisbane

15:55 EST

The mercury is forecast drop into single figures by Friday morning in Queensland's capital, as cold and very dry air migrates across the region from the southwest.