Midnight sun (also known as polar day or nightless night) is one of the special features of the Finnish summer. It is a phenomenon when sun doesn’t set below horizon. Not even during the night. So the sun stays visible for the whole 24 hours of the day. This natural phenomenon occurs every summer in the areas north of the Arctic Circle.
As Finland is located in the far north, the endless summer days can be enjoyed in Northern Finland, in Lapland. The length of the phenomenon depends on how far north you are in. At the Arctic Circle midnight sun occurs around summer solstice at June 21st. The farther north you travel, the longer the polar days lasts. In the most northern part of Finland the sun doesn’t set below horizon for 73 days.