Route 15 · The El Niño-ness Meter
Is this winter behaving like an El Niño?
A strong El Niño leaves a fingerprint on U.S. weather: a warm north, and a wet, cool southern tier from California to Florida. Every day this meter lays the last 30 days of temperature and precipitation over that fingerprint, across NOAA's 344 climate divisions, and scores the match. +1 is the textbook pattern, 0 is unrelated, −1 is its opposite.
Day by day
Each point scores the 30 days ending that day. The grey bands span the middle half of what past strong El Niño months scored.
The last 30 days against the fingerprint
Observed, last 30 days
Standardised anomaly against PRISM's 1991–2020 normals
The strong El Niño fingerprint
Average standardised anomaly of the 9 strong El Niño winters, same calendar days, trend removed