El Niño 2009
2009 was an El Niño year: 6 of 12 three-month seasons had El Niño-level ONI and 3 La Niña-level. The most extreme value was +1.5 °C in NDJ.
Episodes in 2009
ONI month by month in 2009
| DJF | JFM | FMA | MAM | AMJ | MJJ | JJA | JAS | ASO | SON | OND | NDJ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -0.9 | -0.8 | -0.6 | -0.3 | +0.0 | +0.3 | +0.5 | +0.6 | +0.7 | +0.9 | +1.3 | +1.5 |
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Frequently asked questions
Was 2009 an El Niño year?
2009 was an El Niño year: 6 of 12 three-month seasons had El Niño-level ONI and 3 La Niña-level. The most extreme value was +1.5 °C in NDJ.
Which ENSO episodes affected 2009?
La Niña 2008-2009 (-0.9 °C), El Niño 2009-2010 (+1.5 °C)
Source: NOAA CPC Oceanic Niño Index (public domain).