El Niño 1999
1999 was an La Niña year: 0 of 12 three-month seasons had El Niño-level ONI and 12 La Niña-level. The most extreme value was -1.5 °C in NDJ.
Episodes in 1999
ONI month by month in 1999
| DJF | JFM | FMA | MAM | AMJ | MJJ | JJA | JAS | ASO | SON | OND | NDJ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -1.5 | -1.3 | -0.9 | -0.8 | -0.8 | -0.8 | -0.9 | -0.9 | -1.0 | -1.1 | -1.4 | -1.5 |
← 19982000 →Full ONI tableStatisticsWeekly update
Frequently asked questions
Was 1999 an El Niño year?
1999 was an La Niña year: 0 of 12 three-month seasons had El Niño-level ONI and 12 La Niña-level. The most extreme value was -1.5 °C in NDJ.
Which ENSO episodes affected 1999?
La Niña 1998-2000 (-1.5 °C)
Source: NOAA CPC Oceanic Niño Index (public domain).