January 2025 was the warmest on record globally, with average surface temperature 0.79 degrees Celsius above 1991-2000 January average, the EU-funded Copernicus Climate Change Service (C3S) reported. According to the report, Arctic Sea ice reached its lowest extent for January, measuring 6% below average. "January 2025 is another surprising month," Samantha Burgess, Deputy Director of C3S, said.