Explore Historic Climate Relationships
El Niño and La Niña can cause the "seasonal climate" – the cumulative effects of the
weather over a season – to deviate from normal at many places around the globe. The following PSL pages
can be used to analyze what happened during past El Niños and La Niñas and provide a guide to what may
happen in the future.
Average ENSO Climate Relationships
A number of ENSO events are averaged together over differeing time periods in order to reduce interannual "noise".
This tool allows single or comparison plots of seasonal averaged variables in relation to El Niño and La Niña over the US and the globe.
Historical temperature/precipitation ENSO probabilities
are available for countries associated with the FEWS NET program.
How ENSO Events Differ
Not all El Nino and La Nina events are the same and there are other differences in the base state between events. For example, there is a strong trend in surface air temperature and the number and timing of MJO events can vary.
Updated!Selected Variables by month for El Niño/La Niña including composite mean and inter-event standard deviation with many different types of variables.
ENSO can have impacts not just on average climate biut also on the extremes of seasonal values.
Given an El Niño or La Niña condition, what are the odds of getting a warm versus a cold season? A wet versus a dry season?