CPC_ONI
Oceanic Niño Index (CPC)
3-month running mean ERSSTv6 Niño 3.4 anomaly, dated on the centre month (DJF = Jan). ±0.5 K for 5 overlapping seasons defines El Niño / La Niña. — CPC · base centred 30-yr periods, updated every 5 yr
DATA THROUGH 2026-10-12 · UPDATED 2026-10-13 11:02 UTC
3-month running mean ERSSTv6 Niño 3.4 anomaly, dated on the centre month (DJF = Jan). ±0.5 K for 5 overlapping seasons defines El Niño / La Niña. — CPC · base centred 30-yr periods, updated every 5 yr