NINO3.4 Index

  • index
  • SOI
  • NINO3.4
NINO3.4 Index

The NINO3.4 index is one of several El Niņo/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 Niņo 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 Niņo or La Niņa event is identified if the 5-month running-average of the NINO3.4 index exceeds +0.4°C for El Niņo or -0.4°C for La Niņa for at least 6 consecutive months.

Site search


Enter a postcode or town name for local weather, or text to search the site. » advanced search

High pressure systems: everything you need to know

16:31 AEST There's been lots of talk about high pressure systems in Australia during the last week and this discussion looks set to continue well into the end of May, possibly longer.

Help with Farmonline Weather