Cold Nordic countries are being seared by “truly unprecedented” heat, as hot weather strengthened and lengthened by carbon pollution continues to roast northern Europe.

A weather station in the Norwegian part of the Arctic Circle recorded temperatures above 30C (86F) on 13 days in July, while Finland has had three straight weeks with 30C heat.

Scientists say it is the longest streak in records going back to 1961, and 50% longer than the previous record.

“Truly unprecedented heatwave still in full swing with maximum today about 32-33C,” said Mika Rantanen, a climate scientist at the Finnish Meteorological Institute, in a social media post on Thursday. “Even the Arctic regions … have seen