Each of us in life can feel the sunshine time in the year in the change, summer sunshine time is long, winter sunshine time is short, this in a region of the day length constantly changing phenomenon is due to the Earth's rotation around the sun produced. For the Northern Hemisphere, where we live, the day is longest on the summer solstice (around June 22) and shortest on the winter solstice (around December 22). From the summer solstice to the winter solstice, the days get shorter, and from the winter solstice to the summer solstice, the days get longer. For those who have questions about this pattern, you can review the "Shift of the Sun's Direct Sunspot" that Giorgio Graffi mentioned earlier.
The above is mainly about the pattern of change of day length in a region in a year, then if we want to compare the average sunshine time in different places in a year, this indicator will be affected by what factors?
First of all, we have to distinguish between the two concepts of day length and sunshine time, day length refers to the length of the day in a region, should be equal to the moment of sunset minus the moment of sunrise, the specific calculation of the back of the GioGraffi will also be introduced in detail, which is a high-frequency test, but also a lot of students can not overcome the difficulties. The sunshine time refers to the sun in a place of the actual number of hours, mainly used to characterize the atmospheric conditions or climate characteristics of a region, so the factors affecting the sunshine time is mainly climate, rather than latitude, we must pay attention to this!
Let's take a look at the average annual sunshine hours in China, from the following chart you can summarize what law? And find what special circumstances?
From the above chart, up to 2018 the average number of hours of sunshine distribution chart can be seen, as a whole, China's annual average number of hours of sunshine presented by the southeast to the northwest increasing trend, mainly because of the southeast coastal areas affected by the monsoon, precipitation is more rainy weather affects the number of hours of sunshine, and inland northwest of the arid climate, precipitation is less, the number of hours of sunshine is longer. In addition, careful friends can find that the annual sunshine hours of the Tibetan Plateau, the western part of the Inner Mongolian Plateau and other areas is about 3,000 hours, because of the high altitude, thin air, sunny weather. The Sichuan Basin, on the other hand, has even less than 1,000 hours of sunshine per year, mainly due to the limitation of topography, more water vapor, more clouds and less sunshine hours.
Next, let's take a look at the world-wide ranking of average annual sunshine hours. Which cities get sunshine? And which cities don't see sunshine all year round?
Top 10 Average Annual Sunshine Hours
01.Yuma, USA, 4015.3h average annual sunshine hours
Yuma is located in the southwestern part of the U.S. state of Arizona, adjacent to California, with an arid climate and annual precipitation of less than 100mm, making it the only city with more than 4,000 hours of sunshine per year, which is equivalent to an average of 10.96 hours of sunshine per day. Yuma also has one of the richest solar resources in the United States.
02.Massa Alam, Egypt, 3,958 hours of sunshine per year
Massa Alam is a port on the Red Sea coast, which has a predominantly tropical desert climate, hot and dry all year round, with few clouds and bright sunshine. Since the inauguration of the local international airport in 2001, Marsa Alam has become a new favorite for divers in the Red Sea region.
03.Calama, Chile, 3926.2h of sunshine per year
Calama is a northern Chilean city located in the western foothills of the Andes, just 21 kilometers from the Chuquicamata open-pit copper mine, at an altitude of 2,266 meters above sea level, with a very arid climate.
04. Dakhla Oasis, Egypt, 3,943.4h of sunshine per year
Located in Egypt's New Valley Governorate, the Dakhla Oasis is one of seven oases in Egypt's Western Desert. More than 500 hot springs, lush orchards, remaining medieval towns and villages, charming mud-brick walled houses and various monuments in the area have become a major tourist attraction for tourists from all over the world.
05. Phoenix, USA, 3871.6h average annual sunshine hours
Both Phoenix and top-ranked Yuma are located in Arizona, of which Phoenix is also the capital. Phoenix is also translated as Phoenix, which is known as Hoozdo in the Navajo language, meaning hot place. Phoenix has a dry climate with the highest average annual temperatures of any major city in the U.S. On average, the temperature exceeds 38 degrees Fahrenheit 89 days per year, almost all of the time from June through September. In addition, the name of the NBA team located in Phoenix is "Phoenix Suns", which means it is sunny all year round.
06. Kitmanshoop, Namibia, average annual sunshine hours 3870h
Kitmanshoop is a town in southern Namibia and the capital of the Karas Region. Located on the edge of the Namib Desert, it has an arid climate with scarce precipitation and long hours of sunshine.
07. Las Vegas, USA, average annual sunshine hours 3825.3h
Las Vegas is the largest city in the U.S. state of Nevada and the world-famous gambling city. Las Vegas is located on the edge of the Nevada desert in the United States and is surrounded by high mountains of 1000-3000 meters. Las Vegas has a typical desert climate in the summer, with midday temperatures often reaching around 38°C and up to 45°C or more.
08. Tucson, USA, average annual sunshine hours 3806h
Tucson is the third city on the list from the southern US state of Arizona, which is located in a desert valley area surrounded by mountains on three sides. The year-round aridity and abundant sunshine have long attracted many tourists, especially the rapid development of the retirement industry represented by the convalescent center, and many elderly people from the northeastern U.S. have purchased properties in Tucson. In addition, Davis-Monthan Air Force Base is located in the city's jurisdiction.
09. Harij, Egypt, average annual sunshine hours 3790.8
Harij is the largest oasis in Egypt's Western Desert, with temple ruins from the fifth century B.C. It is a famous tourist destination in Egypt. Year-round arid climate, in order to develop agriculture, built irrigation systems, improved soil, more developed agriculture.
10. El Paso, USA, average annual sunshine hours 3762.5h
El Paso is located in the western part of the US state of Texas. The city's name, El paso, is Spanish for "The Pass", which refers to the banks washed by the Rio Grande. The climate is dry, with little water vapor and thin cloud cover.
Next up: the Top 10 of not seeing the sun
01. Totoro, Colombia, average annual sunshine hours 637h
Totoro is located in southwestern Colombia, under the jurisdiction of the department of Cauca, where the climate is hot and humid all year round, with an annual precipitation of more than 1,500 millimeters.
02. Tórshavn, Faroe Islands, average annual sunshine hours 840h
Tórshavn is the capital of the Faroe Islands, and the name of the city can be interpreted as "Thor's Harbor", the name of the god of thunder in Norse mythology. The Faroe Islands have a lot of rain and cloudy weather throughout the year due to the westerly winds and the convergence of warm and cold currents, making sunshine a bit of a luxury for the Faroe Islands.
03. Chongqing, China, average annual sunshine hours 954.8
Chongqing, China's youngest municipality, is known as the "City of Mountains" and the "City of Mist". Chongqing is mountainous, with mountains accounting for more than two-thirds of its total area, and has a subtropical monsoon climate with abundant precipitation. In addition, the Jialing River in Chongqing Chaotianmen dock into the Yangtze River, water vapor content. A combination of factors makes Chongqing foggy, and the number of sunshine hours is correspondingly low.
04. Dixon, Russia, 1164.3h average annual sunshine hours
Located near the mouth of the Yenisei River at 73°N, Dixon is affected by the Arctic climate, with 10 months of winter each year. Not only is the sun absent for 2 months, but also due to the cold, wet climate and high cloudiness, the sun is not always visible when it is present.
05. Malabo, Equatorial Guinea, average annual sunshine 1176.7h
Malabo is the capital of Equatorial Guinea and is located on a volcanic island surrounded by the sea and in the equatorial region, which has a tropical maritime climate, thus Malabo has abundant precipitation and very low average annual sunshine hours.
06. Buenaventura, Colombia, average annual sunshine 1178h
Buenaventura is the largest port in Colombia and the most important city on the country's Pacific coast. Located on the island of Cascajal in the Gulf of Buenaventura, the city is connected to the mainland by a bridge and is an important hub for Colombia's foreign trade. Due to its location on the coastal strip near the equator, the climate is warm and humid with high precipitation.
07. Lima, Peru, average annual sunshine hours 1230h
Lima is the capital of Peru and is divided into two parts: the old city and the new city. Lima is known worldwide as a rainless city, with no thunder, lightning or storms throughout the year, and ice and snow are unheard of. Although there is no precipitation, Lima's average annual sunshine hours are surprisingly low, and some scholars speculate that it has something to do with the air pollution caused by the large-scale development of industry in Lima.
08.Ushuaia, Argentina, average annual sunshine hours 1281.2h
Ushuaia is located in the south of Argentina, 3,200 kilometers away from Buenos Aires, the capital of the country, but only 800 kilometers away from Antarctica, the southernmost city in the world, also known as the end of the world. Ushuaia is an ideal base to set sail and resupply for expeditions and expeditions to Antarctica. Due to its location in the Westerly Wind Belt, which is subject to prevailing westerly winds and westerly drifts all year round, Ushuaia is cold and wet all year round, and sunshine is hard to come by.
09.Reykjavik, Iceland, 1,326h average annual sunshine hours
Reykjavik is the capital city of Iceland, as well as the country's first city and first port. Located at 64°N, Reykjavik is very close to the Arctic Circle, but is influenced by the North Atlantic Warm Current and has a relatively mild climate. However, the coast, and the abundance of geothermal resources, results in a high water vapor content over the city of Reykjavík, which affects the hours of sunshine.
10. Bogotá, Colombia, average annual sunshine hours 1328h
Bogotá is the capital of Colombia and one of the more rapidly urbanizing cities in the Latin American region. Bogotá's Bus Rapid Transit (BRT) system is globally renowned and is emulated by many regions. Bogotá is close to the equator, but is located in a mountainous area with a relatively cool climate. Similar to Chongqing, Bogotá's average annual sunshine hours are relatively low.
