The chart shows the sea surface temperature (SST) anomalies in the Niño 3.4 region. The data is used to study the phenomenon of El Nino. El Niño (La Niña) is a phenomenon in the equatorial Pacific Ocean characterized by a five consecutive 3-month running mean of sea surface temperature (SST) anomalies in the Niño 3.4 region that is above (below) the threshold of +0.5°C (-0.5°C).
