El Niño 2021
2021 was an La Niña year: 0 of 12 three-month seasons had El Niño-level ONI and 8 La Niña-level. The most extreme value was -1.0 °C in DJF.
Episodes in 2021
ONI month by month in 2021
| DJF | JFM | FMA | MAM | AMJ | MJJ | JJA | JAS | ASO | SON | OND | NDJ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -1.0 | -0.8 | -0.7 | -0.6 | -0.4 | -0.3 | -0.3 | -0.5 | -0.6 | -0.8 | -0.9 | -0.8 |
Weekly updates from 2021
Dec 29: -1.1 °CDec 22: -1.0 °CDec 15: -1.1 °CDec 8: -1.1 °CDec 1: -0.9 °CNov 24: -0.7 °CNov 17: -0.9 °CNov 10: -0.9 °C
← 20202022 →Full ONI tableStatisticsWeekly update
Frequently asked questions
Was 2021 an El Niño year?
2021 was an La Niña year: 0 of 12 three-month seasons had El Niño-level ONI and 8 La Niña-level. The most extreme value was -1.0 °C in DJF.
Which ENSO episodes affected 2021?
La Niña 2020-2021 (-1.1 °C), La Niña 2021-2023 (-0.9 °C)
Source: NOAA CPC Oceanic Niño Index (public domain).