The heat wave in northern Norrland began on July 10. It can "certainly have been experienced as one long heat wave since then", writes SMHI in a comment.
What stands out is that it has been so long-lasting in the north and the tropical nights, says Charlotta Eriksson, meteorologist at SMHI.
There were a whole ten tropical nights in a row at Rödkallen by Botttenvikskusten, where the night temperature was not below 20 degrees.
Haparanda and Jokkmokk stand out, and are on a par with the longest heat wave in over 100 years. Haparanda has had over 25 degrees for 14 days in a row, between July 12 and 25. A heat wave of the same length occurred last in 1913.
In Jokkmokk, this year's heat wave lasted for 15 days, between July 11 and 25. 100 years ago, Jokkmokk had a heat wave of 16 days in July. In Luleå and Piteå, it was broken by some cooler days, with just over 24 degrees on July 17-18.
The highest temperature in northern Norrland was measured at Skellefteå airport with 33.6 degrees on July 24. And it's not over. SMHI warns of new high temperatures in eastern Norrbotten and northeastern Västerbotten - roughly from Skellefteå to Pajala. Until August 2, maximum temperatures of 25-30 degrees are expected.
On Friday, Pajala had its warmest day so far, since measurements began, with 29.6 degrees, reports P4 Norrbotten.
In all of Sweden, the month of July has been warmer than normal. But the average temperature for the month can still not be compared to July 2018 or July 2014. This is because this year's July started with cool nights, writes SMHI.
If at least five days have a daytime temperature of at least 25 degrees, it is considered a heat wave.
