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

ANZAC Day Dawn Service Forecast

14:40 AEST What will the weather be like for ANZAC Day Dawn Services around the country? Sydney will be dry with temperatures ranging from around 18 degrees in the east to 14 in the west.

Help with Farmonline Weather