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NINO3.4 Index

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  • 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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Why temperatures at night are going up around the world and what we can do about it

06:06 EST

History was made in the Middle East on June 28 when the world's hottest night on record was set in Quriyat, Oman with the overnight "low" dropping to 42.6 degrees Celsius.

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05:00 EST

Over the last three decades the Great Barrier Reef has been hit by a series of intense cyclones, bleaching, crown of thorn starfish outbreaks and flood events that have caused well-documented, but reparable damage.

Blizzards followed by blue skies

18:56 EST

A strong cold front will bring a dumping of snow and damaging winds to the Alps later on Thursday into Friday.