Fairfax Media Network

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.

Display Your Local Weather

Weather News

Tropical Cyclone Marcus: Darwin schools to close as clean-up continues

01:50 EDT

Schools across Darwin will close on Monday as emergency services work to restore power and water in the wake of Tropical Cyclone Marcus.

BOM forecasts sweltering day in Sydney with 40C in the CBD and 39C in Bondi

01:45 EDT

Total fire bans are in place across 11 regions in New South Wales, while temperatures are forecast to soar in Sydney on Sunday with the mercury predicted to reach 40C in the CBD and western suburbs.

Bushfires near Warrnambool continue to rage, houses lost in Victoria's west

01:29 EDT

Up to a dozen homes have been destroyed or damaged by bush and grass fires which continue to burn in Victoria's south-west.