El Niño Winter 2026-2027: What a Super El Niño Really Does

This is not a marginal event. As of the September 2026 CPC ENSO Diagnostic Discussion, El Niño is present and strengthening, with a greater than 90% chance of reaching “very strong” intensity through the winter. CPC’s forecast puts roughly a 69% chance that the October-December ocean index tops +2.5°C — a threshold not reached since ENSO bookkeeping began in 1950. In plain terms, this winter is forecast to rank with, or ahead of, the three strongest El Niño events we have ever measured.

That is exactly why the three winters in our analysis — 1982-83, 1997-98 and 2015-16 — are the right yardstick. They are the only past events in the same weight class, and they are the analogs professional forecasters lean on too. If you want the fuller ocean-and-atmosphere picture and how this El Niño has evolved through 2026, that lives on our full El Niño 2026 forecast. This page is about one question only: what it does to winter on the ground.

If you live north of roughly the Ohio River, a strong El Niño is your friend if you hate winter. The 9 cities that ran at least a full degree warm are every one of them in the northern half of the country, and the effect gets bigger the farther north you go. Minneapolis is the poster child: a normal Minneapolis winter averages a brutal 19.2°F, but across the three benchmark El Niño winters it averaged 24.6°F. Five and a half degrees does not sound like much until you have shoveled the difference.

The consistency is what makes it forecast-worthy. Minneapolis ran 23.9°F, 25.7°F and 24.3°F in the three winters — every one of them well above normal, not one warm outlier dragging up an average. New York City went 37.9°F, 39.5°F, 41.1°F, warming each time. When the same signal shows up in three independent events, it is a pattern, not luck.

Head to the Sun Belt and the temperature signal fades to nothing. Atlanta, Los Angeles, Tampa, Jacksonville and New Orleans all finished within a few tenths of a degree of a normal winter. Phoenix and Las Vegas actually ran about a degree cooler than normal — the flip side of all those extra clouds and rain. So if a headline tells you “El Niño means a mild winter,” ask “mild where?” It is mild in Minnesota, not in Miami. For the state-by-state breakdown, see how El Niño hits each state.

Flip the map upside down and you get the precipitation story. The wettest anomalies in the whole dataset are all in the southern tier and along the West Coast, where the El Niño-charged subtropical jet drags storm after storm ashore:

• Miami — 249% of its normal winter rain
• Tampa — 216% of its normal winter rain
• Jacksonville — 173% of its normal winter rain
• Los Angeles — 157% of its normal winter rain
• New Orleans — 156% of its normal winter rain

Miami is almost off the chart: nearly two-and-a-half times a normal winter’s rain. Tampa more than doubled, Jacksonville ran 73% above normal, and drought-weary California saw Los Angeles at 157% and San Francisco at 147%. For the Southwest and California, a super El Niño is the closest thing the atmosphere offers to a drought-buster — though, as 2015-16 taught Northern California, the rain does not always fall where the reservoirs need it.

The dry side of the ledger is smaller but real: the interior Southwest desert (Las Vegas came in at 95% of normal) and, in the classic pattern, the Pacific Northwest interior and northern Rockies. Our coastal Northwest stations actually ran wet this time (Portland 148%, Seattle 124%), a reminder that the “dry North” part of the textbook El Niño map is the least reliable piece of it.

This is the finding the “warm winter, less snow” shorthand gets wrong. Yes, the mild northern cities lost snow — but the cities under the southern storm track gained it. In the same three benchmark winters:

For each city we took a single long-record airport or first-order weather station and pulled every daily observation from our copy of NOAA’s Global Historical Climatology Network-Daily archive. We computed the meteorological-winter (December through February) mean temperature and total precipitation for the three strongest El Niño winters on record — 1982-83, 1997-98 and 2015-16 — and compared each to the same station’s 1991-2020 normal. Quality-flagged observations were excluded. Every number on this page traces to that query, run September 6, 2026; the ENSO strength figures are cited from NOAA’s Climate Prediction Center, not our database.

Two honest limits. First, a strong El Niño is not the same thing as a super El Niño, and composites smooth over the within-winter swings that people actually remember. Second, our normal period (1991-2020) already includes two of the three analog winters, which slightly shrinks the measured anomalies — the true departure from a mid-century baseline would be a touch larger. We chose the modern normal on purpose, because it is the winter today’s readers actually expect.