Current State of ENSO
Here are the latest sea surface temperature anomalies over the last 12 weeks.
An El Niño (La Niña) event is categorized by the sea surface temperature anomalies are above (below) 0.5°C for three consecutive months, with the typical development of these events in the fall/winter months.
On average, an El Niño event occurs every 2-7 years. La Niñas typically occur right after El Niño events, but that isn’t always the case.