In connection with SVT Nyheter's unique mapping of the changing winter climate in Sweden, SVT was tipped off about Rune Axelsson in Vindeln.
In a number of diaries, he has noted when the ice disappears on Lake Djupsund where he has his summer cottage.
Rune's notes have now interested researchers at the Swedish University of Agriculture, SLU, who among other things are studying climate change in the nearby research area Svartberget.
- It is perhaps a small contribution to the climate debate, he says.
Rune's notes from 1983.
"Is a bit worrying"
Runes Axelsson's notes show that the ice is 20 days shorter than 50 years ago.
He points out that it is not a scientific investigation, but still believes that one should be able to draw certain conclusions.
And he himself is a little torn about what the notes show.
- It might be nice to have a slightly longer summer, but it is a bit worrying that it is happening so quickly, he says.
In the clip: Hear Rune read from the diaries and explain why he took notes so carefully.