The sun has begun to shine with its absence and the weather takes on significantly grayer tones.
But all around, nature explodes with colors as the green changes to autumnal foliage.
- The yellow and orange color comes from carotenoids, which are found in carrots, among other things.
The red color occurs when the sugar in the leaf is converted to anthocyanin during cold nights, says Marcus Sjöstedt.
In the clip, you hear about the perfect weather for a colorful environment - and see the viewers' photos from Norrbotten's magnificent nature.