Why do areas north of the Arctic Circle in Northern Hemisphere experience a polar day lasting for several months during summer?

Areas north of the Arctic Circle experience a polar day during the summer months because the Earth's axis of rotation is tilted. As the Earth orbits the Sun, the tilt causes different parts of the planet to receive more or less direct sunlight at different times of the year. During the Northern Hemisphere's summer, the Earth's Northern Hemisphere is tilted towards the Sun, which means that areas north of the Arctic Circle receive nearly 24 hours of daylight each day.

The polar day begins on the first day of summer, which is June 21st, and ends on the last day of summer, which is September 21st. During this time, the Sun does not set below the horizon at the Arctic Circle, and instead circles around the sky. This is because the Sun's path in the sky is parallel to the horizon at the Arctic Circle during the summer months.

The length of the polar day increases the further north you go from the Arctic Circle. At the North Pole, the polar day lasts for six months, from March 20th to September 21st. This is because the North Pole is tilted directly towards the Sun during this time.

The polar day has a significant impact on the environment and the lives of people living in the Arctic Circle. The constant sunlight can cause the temperature to rise, leading to melting of ice and snow. This can have a negative impact on the local ecosystem and can also cause problems for human activities, such as transportation and construction. Additionally, the constant daylight can make it difficult for people to sleep and can disrupt their circadian rhythms.