The months from May to July in the summer have no darkness at night. They only have a twilight during the night hours. The months of November to January are the other way around. They have little daylight. It is light for about 21 hours every day between May 10 and August 2. It is light less than four hours each day between November 18 and January 24. On clear winter nights, the aurora borealis, or "Northern lights" can often be seen dancing in the sky.