El Niño 1991
1991 was an El Niño year: 7 of 12 three-month seasons had El Niño-level ONI and 0 La Niña-level. The most extreme value was +1.4 °C in NDJ.
Episodes in 1991
ONI month by month in 1991
| DJF | JFM | FMA | MAM | AMJ | MJJ | JJA | JAS | ASO | SON | OND | NDJ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| +0.3 | +0.3 | +0.2 | +0.3 | +0.5 | +0.6 | +0.8 | +0.7 | +0.7 | +0.8 | +1.2 | +1.4 |
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Frequently asked questions
Was 1991 an El Niño year?
1991 was an El Niño year: 7 of 12 three-month seasons had El Niño-level ONI and 0 La Niña-level. The most extreme value was +1.4 °C in NDJ.
Which ENSO episodes affected 1991?
El Niño 1991-1992 (+1.5 °C)
Source: NOAA CPC Oceanic Niño Index (public domain).