El Niño 1963-1964
El Niño 1963-1964 lasted about 10 months, from Jun–Aug 1963 to Jan–Mar 1964. The Oceanic Niño Index peaked at +1.2 °C in OND 1963, a moderate El Niño, ranked #12 of 23 since 1950.
StartJJA 1963Jun–Aug
EndJFM 1964Jan–Mar
Duration10 months8 seasons
Peak ONI+1.2 °COND 1963
Average ONI+0.98 °Cduring the episode
StrengthModerate#12 / 23
ONI before, during and after El Niño 1963-1964
Season by season
| Season | Year | ONI | Niño 3.4 temp. |
|---|---|---|---|
| JJA Jun–Aug | 1963 | +0.8 °C | 27.61 °C |
| JAS Jul–Sep | 1963 | +1.1 °C | 27.61 °C |
| ASO Aug–Oct | 1963 | +1.1 °C | 27.42 °C |
| SON Sep–Nov | 1963 | +1.1 °C | 27.37 °C |
| OND Oct–Dec | 1963 | +1.2 °C | 27.39 °C |
| NDJ Nov–Jan | 1963 | +1.1 °C | 27.33 °C |
| DJF Dec–Feb | 1964 | +0.9 °C | 27.26 °C |
| JFM Jan–Mar | 1964 | +0.5 °C | 27.09 °C |
Compare with other episodes
← El Niño 1957-1958El Niño 1965-1966 →La Niña 1964-1965El Niño 2026 (current)
Frequently asked questions
When did El Niño 1963-1964 start and end?
It started in JJA 1963 and ended in JFM 1964, about 10 months.
How strong was El Niño 1963-1964?
Its peak ONI was +1.2 °C (OND 1963), classified as moderate. It ranks #12 among 23 El Niño episodes since 1950.
How does it compare with the current El Niño?
The current event (El Niño 2026) has reached +2.5 °C so far, above the +1.2 °C peak of El Niño 1963-1964.
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.