Midnight sun
In the Arctic, the alternation of day and night has its own special rhythm: it may be sunny at midnight and dark at noon. These areas only have the sun for part of the year. The length of extreme day or night depends on latitude: 90 degrees north latitude (the point where the North Pole itself is located) for 6 months; 80 degrees north latitude for 4 months; 70 degrees north latitude for 2 months; 66 degrees north latitude (Arctic Circle) for 24 hours.
The seasons in the Arctic have their special cycles: long in winter and short in summer. The sun shines obliquely at a low angle and reaches the ground after passing through the thick atmosphere. Because of this, there is not much heat left by the sun, and some of it is reflected by snow and ice, so winter is also the coldest period. The absolute lowest temperature recorded in Greenland is MINUS 70℃. In the Arctic, the average temperature in the hottest month is only lo℃, where the ground is always frozen, and the cold cracks the rocks.
You can see the polar day.