El Niño 2004
2004 was an El Niño year: 5 of 12 three-month seasons had El Niño-level ONI and 0 La Niña-level. The most extreme value was +0.7 °C in NDJ.
Episodes in 2004
ONI month by month in 2004
| DJF | JFM | FMA | MAM | AMJ | MJJ | JJA | JAS | ASO | SON | OND | NDJ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| +0.3 | +0.3 | +0.2 | +0.1 | +0.1 | +0.2 | +0.4 | +0.5 | +0.6 | +0.6 | +0.6 | +0.7 |
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Frequently asked questions
Was 2004 an El Niño year?
2004 was an El Niño year: 5 of 12 three-month seasons had El Niño-level ONI and 0 La Niña-level. The most extreme value was +0.7 °C in NDJ.
Which ENSO episodes affected 2004?
El Niño 2004-2005 (+0.7 °C)
Source: NOAA CPC Oceanic Niño Index (public domain).