The climate phenomenon known as La Niña has been the subject of meteorological studies for decades due to its strong influence on global weather patterns. After its intermittent presence in previous years, all indications are that La Niña will return with a vengeance in 2025 , bringing significant consequences for various regions of the planet.
But what exactly is La Niña, and what impact could it have on Earth this year? Here’s how.
La Niña is a natural climate phenomenon that is part of the ENSO (El Niño–Southern Oscillation) cycle. It is characterized by an anomalous cooling of the surface waters of the central and eastern equatorial Pacific Ocean. Unlike El Niño , which warms these waters, La Niña causes a drop in temperatures that alters wind, precipitation, and temperature patterns worldwide .
The possible effects of La Niña in 2025
According to projections from organizations such as NOAA (National Oceanic and Atmospheric Administration), La Niña could intensify in the second half of 2025 , impacting each continent differently.
Latin America
- In South America , especially in countries such as Colombia, Peru, Ecuador and Brazil, heavy rains, flooding of rivers and increased risk of landslides and flooding are expected .
- In southern Chile and Argentina , on the other hand, there could be a prolonged drought , affecting agriculture and water supply.
North America
- In the United States and Mexico , La Niña typically brings drier, warmer winters to the south of the country, while the north could face more intense cold waves .
- There are also fears of a longer Atlantic hurricane season , as La Niña favors atmospheric conditions for stronger storms.
- In Australia , La Niña can result in torrential rains and flooding , especially in the north and east of the country.
- In Southeast Asia , a more active monsoon season is expected , which could have both positive (reservoir filling) and negative (damage from excess water) consequences.
Africa and Europe
- East Africa could benefit from increased rainfall , which is positive for drought-stricken areas.
- In Europe , the effects of La Niña are more variable, but colder winters are expected in the north and moderate droughts in the Mediterranean region .
Environmental and social impact
The effects of La Niña are not limited to the climate. Its presence can exacerbate humanitarian crises , affect agricultural production , disrupt food markets , and strain the infrastructure of numerous countries. The increase in extreme events such as hurricanes, wildfires, and floods will be one of the main challenges for governments and communities.
