El Niño Dashboard Pro — Advanced ENSO Data Tools
Data source: NOAA Climate Prediction Center. ONI values use 1991–2020 base period. Last updated: May 2026.
Oceanic Niño Index (ONI) — 1950 to Present
The ONI is NOAA's standard for classifying El Niño and La Niña events. El Niño = ONI ≥ +0.5°C for 5 consecutive overlapping seasons. La Niña = ONI ≤ -0.5°C for 5 consecutive overlapping seasons.
Recent ONI Values
| Season | Year | ONI (°C) | Status |
|---|
ENSO Forecast Plume — Annotated Model Breakdown
The IRI/CPC ENSO forecast plume shows model predictions for Niño 3.4 SST anomalies over the next 9 months. Each line represents a different dynamical or statistical model with confidence intervals.
IRI/CPC ENSO Forecast Plume — updated weekly. View full report · Download PDF report
El Niño Event Comparison
Compare the intensity and progression of major El Niño events side by side. Select events to overlay on the same chart.
What is the Oceanic Niño Index?
The ONI is the de facto standard for measuring ENSO. It is the 3-month running mean of SST anomalies in the Niño 3.4 region (5°N–5°S, 120°W–170°W), relative to the 1991–2020 base period.
| ONI Range | ENSO State | Intensity |
|---|---|---|
| ≥ +2.0°C | El Niño | Very Strong |
| +1.5 ~ +1.9°C | El Niño | Strong |
| +1.0 ~ +1.4°C | El Niño | Moderate |
| +0.5 ~ +0.9°C | El Niño | Weak |
| -0.4 ~ +0.4°C | Neutral | — |
| -0.9 ~ -0.5°C | La Niña | Weak |
| -1.4 ~ -1.0°C | La Niña | Moderate |
| -1.9 ~ -1.5°C | La Niña | Strong |
| ≤ -2.0°C | La Niña | Very Strong |
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