Why is the sunshine in the Arctic long and cold in summer?

First of all, the North Pole is located in the northernmost part of the earth. Although there are many places that can be irradiated by the sun, the acceptable total amount of sunlight is very small because of the small angle with the sun. Secondly, because most of Greenland near the North Pole is covered with snow and ice, it reflects most of the sunlight, which makes the total amount of sunlight absorbed less. The Arctic Ocean is water with large specific heat capacity, so it will absorb a lot of heat when it warms up, making the air temperature low.