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How are sunshine hours calculated?

Author

Andrew Walker

Published Feb 23, 2026

How are sunshine hours calculated?

Measurement is performed by instruments called sunshine recorders. For the specific purpose of sunshine duration recording, Campbell–Stokes recorders are used, which use a spherical glass lens to focus the sun rays on a specially designed tape. When the intensity exceeds a pre-determined threshold, the tape burns.

Also to know is, how many hours does the sunshine a day?

There is an average of 2439 hours of sunlight per year (of a possible 4383) with an average of 6:40 of sunlight per day.

Additionally, where is the most hours of daylight? According to records from weather stations across the US, Yuma in Arizona is the sunniest place in the world. During daylight hours, which range from 11 hours in winter to 13 in summer, it has a 90% possibility of sunshine.

Correspondingly, how do you determine sunshine?

To determine full sun or full shade, look at the area in the morning and mid-morning and watch throughout the day until dusk. Most full sun areas have sunlight from at least 10 a.m. through 5 p.m., while most full shade locations will get a little bit of morning sun but be shielded from it for at least six full hours.

Where is the cloudiest place on earth?

Tórshavn, Faroe Islands is the cloudiest city in the world based on sunlight duration.

Which state gets the least sunshine?

Of the 30 cities that get the least sun, eight are in New York, six are in Washington, and five are in Pennsylvania. Maine, Ohio, and Wisconsin are each home to two cities, while Idaho, Michigan, Minnesota, Vermont, and West Virginia are each home to one.

Which country has the longest night?

The Longest Night in the World in Ushuaia.

What city has the most days of sunshine?

Sunniest Cities in the U.S.
RankCityAnnual % average possible sunshine
1YUMA, AZ90%
2REDDING, CA88%
3LAS VEGAS, NV85%
4PHOENIX, AZ85%

Which states get the most sunshine?

Yuma, Arizona tops the list of places in United States with the most sun. Generally it's sunny in Yuma for 90% of the time from sunrise to sunset. In fact, with its typical 4300 sunny hours a year, Yuma achieves the world record for most recorded annual average sunshine.

What is the average days of sunshine by state?

The tables below pull together numbers on the amount of sunshine that each US state usually has in a year. There's information by state on the annual averages for percent, hours and days of sun.

Average Annual Sunshine by State.

StateArizona
PlaceTucson
% Sun85
Total Hours3806
Clear Days193

Which countries have the longest days?

It's only a continent. The northernmost part of Greenland is also the most northern land on earth. Therefore, Greenland has the longest days of the year. (Greenland also has the shortest days of the year of any country.)

Where is Sun now?

The Sun is currently in the constellation of Aries. The current Right Ascension of The Sun is 02h 25m 55s and the Declination is +14° 27' 11”. The current magnitude of The Sun is -26.73 (JPL).

Where is the shortest day on Earth?

Shortest Day of the Year in the Northern Hemisphere. The December solstice can be on December 20, 21, 22, or 23. The North Pole is tilted furthest from the Sun. It is the winter solstice in the Northern Hemisphere, where it is the darkest day of the year.

Which country has 24 hours daylight?

Iceland: The Land of the Midnight Sun
Iceland is not the only country in the world to experience this dazzling natural phenomenon; all countries north of the Arctic Circle and south of the Antarctic Circle will also experience the Midnight Sun during their summer months.

Which country has the least daylight hours?

the minimum day light is the country in the north pole arctic region is Canada and Greenland almost no sunlight. Iceland will be minimum sunlight in winter solstice for few hours.

Which country has the longest sunlight?

Those countries are Canada, Norway, Sweden, Finland, Russia, Denmark (Greenland) and the USA (Alaska). The land closest to the North Pole of the world is the tip of Ellesmere Island which belong to Canada so this is where you would have on land the longest hours of daylight.