Over the last 19 months, 18 have seen global average surface temperatures at least 1.5 degrees Celsius above pre-industrial levels, continuing a concerning trend of record-breaking temperatures.

"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 world set yet another monthly heat record in January, despite an abnormally chilly U.S., a cooling La Nina​​ and predictions of a slightly less hot 2025, the European climate service Copernicus says.