Winter sea ice in the Arctic has reached a record low in 2025, according to Nasa and the US’s National Snow and Ice Data Center. The annual peak, recorded on 22 March, was the lowest since records began 47 years ago, with sea ice covering just 5.53m sq miles – about 1.1m sq miles less than last year – and 30,000 sq miles below the previous low in 2017. The Gulf of St Lawrence had almost no ice, while the Sea of Okhotsk experienced notably lower than average sea ice extent.
In late January, sea ice extent in the Arctic unexpectedly decreased, losing an area the size of Italy (more than 115,000 sq miles). This can be attributed to cyclones pushing southerly winds in the Barents and Bering seas, causing ocean waves that broke apart and melted thin ice at the edge of the ice sheet. Temperatures up to 12C above normal were recorded between northern Greenland and the north pole.
