La Niña 2011-2012
La Niña 2011-2012 lasted about 9 months, from Jul–Sep 2011 to Jan–Mar 2012. The Oceanic Niño Index peaked at -1.0 °C in OND 2011, a moderate La Niña, ranked #13 of 20 since 1950.
StartJAS 2011Jul–Sep
EndJFM 2012Jan–Mar
Duration9 months7 seasons
Peak ONI-1.0 °COND 2011
Average ONI-0.77 °Cduring the episode
StrengthModerate#13 / 20
ONI before, during and after La Niña 2011-2012
Season by season
| Season | Year | ONI | Niño 3.4 temp. |
|---|---|---|---|
| JAS Jul–Sep | 2011 | -0.5 °C | 26.45 °C |
| ASO Aug–Oct | 2011 | -0.8 °C | 26.00 °C |
| SON Sep–Nov | 2011 | -0.9 °C | 25.77 °C |
| OND Oct–Dec | 2011 | -1.0 °C | 25.63 °C |
| NDJ Nov–Jan | 2011 | -0.9 °C | 25.64 °C |
| DJF Dec–Feb | 2012 | -0.7 °C | 25.84 °C |
| JFM Jan–Mar | 2012 | -0.6 °C | 26.22 °C |
Compare with other episodes
← La Niña 2010-2011La Niña 2017-2018 →El Niño 2014-2016El Niño 2026 (current)
Frequently asked questions
When did La Niña 2011-2012 start and end?
It started in JAS 2011 and ended in JFM 2012, about 9 months.
How strong was La Niña 2011-2012?
Its peak ONI was -1.0 °C (OND 2011), classified as moderate. It ranks #13 among 20 La Niña episodes since 1950.
Episodes are computed from NOAA's Oceanic Niño Index (ERSSTv5) with the standard rule: five or more consecutive overlapping seasons at or beyond ±0.5 °C. Free to cite with a link to elninoforecast.com.