Like I mentioned earlier, the sun doesn't rise in Tromsø between November 21st and January 21st. This period is called "Polar Night" (mørketid in Norwegian). While it gets a bit lighter during the day, you don't actually see the sun, which can really affect your energy, motivation and mood. However, between May 20th and July 22nd the sun never sets! This period is called "Midnight Sun" (midnattssol in Norwegian). It stays bright out all day, so you can start a hike at 8:00 pm and still find your way.
