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Summer night in the city of Pori, Finland on July 2, 2010. The term "midnight sun" refers to the consecutive 24-hour periods of sunlight experienced north of the Arctic Circle and south of the Antarctic Circle. Other phenomena are sometimes referred to as "midnight sun", but they are caused by time zones and the observance of daylight saving time.
Because of Anchorage's high latitude, summer days are very long and winter daylight hours are very short. The longest day of sunlight being 18hrs and 21 minutes, and shortest being 5 hours and 28 minutes. Anchorage is often cloudy during the winter, which decreases the amount of sunlight experienced by residents.
The sun does not rise at all during some weeks in the winter, and is out for 24 hours during some weeks in the summer. However, despite 24 hours of sunshine in the summertime, the average low temperature is barely above freezing in Utqiaġvik in July, at 36 °F (2.2 °C) and snow may fall any month of the year. [4]
Polar night is a phenomenon in the northernmost and southernmost regions of Earth where night lasts for more than 24 hours. This occurs only inside the polar circles. [1] The opposite phenomenon, polar day, or midnight sun, occurs when the Sun remains above the horizon for more than 24 hours. "Night" is understood as the center of the Sun being ...
Fairbanks receives an average 21 hours of daylight between May 10 and August 2 each summer, and an average of less than four hours of daylight between November 18 and January 24 each winter. The interior of Alaska is largely underlined by discontinuous permafrost, which grades to continuous permafrost as the Arctic Circle is approached.
The city is often cloudy during the winter, which further decreases the amount of sunlight experienced by residents. [48] The coldest daily maximum recorded in Anchorage was −19 °F (−28 °C) in January 1989, while the coldest daily maximum on average between 1991 and 2020 was 1 °F (−17 °C). [44]
Winters are long and frigid, and because the area is above the Arctic Circle, the sun does not rise during several weeks of each winter. Summers bring long daylight hours, with 24 hours of daylight during some summer weeks, but are still cool, being mostly between 45 and 55 °F (7 and 13 °C) and sometimes dropping to the freezing point.
By the end of October, the amount of sunlight is around 6 hours. When the sun sets on November 18, it stays below the horizon until January 23, resulting in a polar night that lasts for about 66 days. When the polar night starts, about 6 hours of civil twilight occur, with the amount decreasing each day during the first half of the polar night.