These outlooks illustrate the probabilities of having above, normal, and below normal temperature and precipitation for the 6 to 10 day period, respectively. The outlooks also include forecast 500 millibar …

The Oceanic Ni ñ o Index (ONI) has become the de-facto standard that NOAA uses for classifying El Ni ñ o (warm) and La Ni ña (cool) events in the eastern tropical Pacific.

PSL's monthly time-series are being consolidated. Please go to their new location here: https://psl.noaa.gov/data/timeseries/month/.

The monthly 30-year climatological values are updated every five years and are used to calculate the anomalies, which in turn are used to calculate the Oceanic Niño Index (ONI).

The ONI is the NOAA official index indicating the state of the ENSO. Correlation of the January NOAA ERSST V5 SST with the January ONI index over the globe.

Jun 25, 2025 · NOAA Climate.gov image, based on data from the Climate Prediction Center. This index tracks one of the signs of El Niño and La Niña: warming or cooling of surface waters in a key location …

Jan 21, 2021 · Data (monthly input to the Oceanic Niño Index) Seasonal ERSSTv5 (centered base periods) "Oceanic Niño Index" or the 3-month running average in Niño 3.4 (5 o North-5 o South) (170 …

Climate Indices: Monthly Atmospheric and Ocean Time Series Please reference time series use in publications! Time series that are regularly updated have a * after their name.

There is also a La Niña Dashboard looking at the recent index values and comparing them to historic La Niña events and a Neutral Dashboard looking at the current year to neutral events.

SEAS YR TOTAL ANOM. DJF 1950 24.72 -1.53. JFM 1950 25.17 -1.34. FMA 1950 25.75 -1.16. MAM 1950 26.12 -1.18. AMJ 1950 26.32 -1.07. MJJ 1950 26.31 -0.85. JJA 1950 26.21 -0.54. JAS 1950 …