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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 flying fox backyard rescues at record high due to food shortage, heat

15:24 EDT

Flying fox rescuers in Sydney are experiencing "the worst season ever" as a record number of bats get caught and injured in nets used to protect backyard fruit trees.

Weekend rainfall on the cards for hot and dry inland NSW

11:55 EDT

With a few days to go until the official end to the summer season, it looks like parts of New South Wales could still see the odd drop of rain.

Elevated fire danger ahead of seemingly benign cold front

11:19 EDT

A weak cold front will clip the southern parts of South Australia today and reach Victoria in the afternoon.