La Niña is a part of the El Niño southern oscillation, a climate fluctuation that slowly sloshes vast bodies of water and heat between different ocean basins and disrupts weather patterns around the world.

"January 2025 is another surprising month, continuing the record temperatures observed throughout the last two years, despite the development of La Niña conditions in the tropical Pacific and their temporary cooling effect on global temperatures," said Samantha Burgess of the Copernicus Climate Change Service.

The last 15 years have warmed at about twice the rate of the previous 40 years. View on euronews

Scientists hoped the emergence of La Nina will slow down the record breaking global warming, but last month broke the record by 0.1C.