El-Niño means the Pacific Ocean around the equator is warmer than normal.
La-Niña means the Pacific Ocean is cooler than normal.
The cycles happen every 3-5 years. El-Niño lasts 9-12 months, typically, followed by La-Niña which lasts 1-3 years.
There have been El-Niño cycles, which lasted up to 3-4 years before.
These two cycles change the wind direction and air temperatures around the globe.
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