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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. [3] 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 ...
At 2:16 a.m., the sun finally dipped below the horizon, marking the first official night in 83 days for Utqiaġvik, Alaska, the northernmost town in the United States.
The following is a list of cities by sunshine duration. Sunshine duration is a climatological indicator, measuring duration of sunshine in given period (usually, a day or a year) for a given location on Earth, typically expressed as an averaged value over several years.
The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time ( UTC−09:00 ). During daylight saving time its time offset is eight hours ( UTC−08:00 ). The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory .
Relationship of Earth's axial tilt (ε) to the tropical and polar circles. The Arctic Circle is the southernmost latitude in the Northern Hemisphere at which the centre of the Sun can remain continuously above or below the horizon for twenty-four hours; as a result, at least once each year at any location within the Arctic Circle the centre of the Sun is visible at local midnight, and at least ...