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El Nino Southern Oscillation
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ENSO Strengths
This table shows the forecast probability (%) of Niño-3.4 index exceeding a certain threshold (in degrees Celsius).
For negative thresholds, the table shows the probability (%) of a Niño-3.4 index value that is less than (more negative) that value.
For positive thresholds, the table shows the probability (%) of a Niño-3.4 index value that is greater than (more positive) that value.
This tool supports the official ENSO Diagnostic discussion updated on the 2nd Thursday of each month.
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Target |
< -1.5°C | < -1.0°C | < -0.5°C | > 0.5°C | > 1.0°C | > 1.5°C |
JJA |
~0 | ~0 | 17 | 1 | ~0 | ~0 |
JAS |
~0 | 5 | 32 | 4 | ~0 | ~0 |
ASO |
1 | 12 | 45 | 4 | ~0 | ~0 |
SON |
4 | 21 | 55 | 3 | ~0 | ~0 |
OND |
8 | 29 | 62 | 3 | ~0 | ~0 |
NDJ |
10 | 34 | 66 | 3 | ~0 | ~0 |
DJF |
8 | 28 | 60 | 4 | ~0 | ~0 |
JFM |
5 | 21 | 54 | 4 | ~0 | ~0 |
FMA |
2 | 14 | 47 | 4 | ~0 | ~0 |
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< -1.5°C | < -1.0°C | < -0.5°C | > 0.5°C | > 1.0°C | > 1.5°C |
The values are based on the analysis published in:
L'Heureux, M. L., Tippett, Michael K., Takahashi, Ken, Barnston, Anthony G., Becker, Emily J., Bell, Gerald D., Di Liberto, Tom E., Gottschalck, Jon, Halpert, Michael S., Hu, Zeng-Zhen, Johnson, Nathaniel C., Xue, Yan, and Wang, Wanqiu, 2019: Strength Outlooks for the El Niño-Southern Oscillation. Wea. Forecasting, 34, 165-175, https://doi.org/10.1175/WAF-D-18-0126.1.
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