I built a free, comprehensive comparison table of every significant El Niño event since 1950 — and I'm sharing it here for researchers, students, and climate writers.
What's in the Table
Each event is ranked by peak Oceanic Niño Index (ONI) with columns for:
- Duration (months with ONI ≥ +0.5°C)
- Peak period (when the event was strongest)
- Key regions affected (which continents/countries got hit hardest)
- Estimated economic damage (from EM-DAT, Munich Re, and peer-reviewed research)
- Estimated fatalities (from disaster databases and WHO reports)
- Post-event La Niña transition (which events flipped and how strong)
The table includes 18 events from 1951 through the developing 2026-27 very strong El Niño.
Quick Highlights
- 5 of the 7 strongest events have occurred in the last 30 years
- 1997-98 cost an estimated $5.7 trillion in long-term GDP suppression (not just the $35-45B in property damage)
- 2023-24 had a lower ONI peak than 1997 but broke every monthly global temperature record because the baseline climate has warmed
- 71% of strong+ events are followed by La Niña within 12 months
- 2026-27 is forecast as potentially the strongest on record
Why I Built This
I was researching El Niño impacts and kept hitting scattered data across NOAA, EM-DAT, academic papers, and old blog posts. Nothing put all the key facts — ONI, duration, cost, deaths, aftermath — in one place. So I built it.
Free to Use and Link
The table is live at https://elninoguide.com/enso-comparison
Feel free to reference it in your own research, writing, or teaching. A link back helps other readers find the data too.
I also maintain a curated directory of the best free ENSO data sources at https://elninoguide.com/enso-resources — NOAA portals, real-time buoy data, forecast models, and historical archives.
Reference data table live at El Niño Guide — ENSO Comparison
Curated ENSO resource directory: https://elninoguide.com/enso-resources
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