La Niña 1984-1985
La Niña 1984-1985 lasted about 11 months, from Sep–Nov 1984 to May–Jul 1985. The Oceanic Niño Index peaked at -1.1 °C in NDJ 1984, a moderate La Niña, ranked #11 of 20 since 1950.
StartSON 1984Sep–Nov
EndMJJ 1985May–Jul
Duration11 months9 seasons
Peak ONI-1.1 °CNDJ 1984
Average ONI-0.84 °Cduring the episode
StrengthModerate#11 / 20
ONI before, during and after La Niña 1984-1985
Season by season
| Season | Year | ONI | Niño 3.4 temp. |
|---|---|---|---|
| SON Sep–Nov | 1984 | -0.6 °C | 25.92 °C |
| OND Oct–Dec | 1984 | -0.9 °C | 25.57 °C |
| NDJ Nov–Jan | 1984 | -1.1 °C | 25.48 °C |
| DJF Dec–Feb | 1985 | -1.0 °C | 25.59 °C |
| JFM Jan–Mar | 1985 | -0.9 °C | 25.95 °C |
| FMA Feb–Apr | 1985 | -0.8 °C | 26.31 °C |
| MAM Mar–May | 1985 | -0.8 °C | 26.67 °C |
| AMJ Apr–Jun | 1985 | -0.8 °C | 26.80 °C |
| MJJ May–Jul | 1985 | -0.6 °C | 26.79 °C |
Compare with other episodes
← La Niña 1983-1984La Niña 1988-1989 →El Niño 1986-1988El Niño 2026 (current)
Frequently asked questions
When did La Niña 1984-1985 start and end?
It started in SON 1984 and ended in MJJ 1985, about 11 months.
How strong was La Niña 1984-1985?
Its peak ONI was -1.1 °C (NDJ 1984), classified as moderate. It ranks #11 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.