What is the temperature during the dog days of summer in 2020? How long will it last? Isn’t it hot after the dog days?
Once we enter summer, the temperature will get higher and higher, and the weather will become hotter and hotter. Of course, this heat will not last forever. After reaching a certain peak, the temperature will slowly drop, and eventually summer will go away. So what is the temperature during the dog days of summer in 2020? How long will it last? Isn’t it hot after the dog days? As the summer sun fills the branches, the leap month of April arrives as expected. Regarding this unusual and confusing special month, Shuimoxiansheng.com has compiled a special article on the leap April 2020 for everyone. Let’s learn about it together!Why is the weather the hottest during the dog days of summer?From a meteorological point of view, this is mainly because after the vernal equinox, the sun's direct point begins to move northward. On the summer solstice, the sun's direct point is located at the Tropic of Cancer, when the most sunlight is received and the solar altitude angle is the largest.Taking Beijing as an example, at noon on the summer solstice, the sun's altitude is 73.5 degrees, and the sunlight is almost directly on the ground. At this time, the thickness of the atmosphere that sunlight passes through is the smallest, and the amount of light and heat absorbed, scattered and reflected by the atmosphere is also small, so more light and heat reaches the ground, which is conducive to the increase in ground temperature. In addition, the summer solstice has the longest daylight hours (for example, the daytime in Beijing is as long as 15 hours). The longer the sunshine hours, the longer the time the earth's surface absorbs heat during the day is greater than the time it radiates heat to the atmosphere at night. This causes the heat accumulated on the ground to increase day by day, and the temperature continues to rise. The dog days of summer begin about 20 days after the summer solstice, during which time the accumulation of surface heat reaches its peak. This is the basic reason why the dog days of summer are the hottest. In addition, there is more rain in summer and the air humidity is high. The heat capacity of water is much greater than that of dry air, which is also an important reason for the hot and humid weather. What is the temperature during the dog days of summer in 2020? How long will it last?The dog days occur between the Lesser Heat and the End of Heat, and are the hottest, most humid and muggy days of the year. The so-called "fu days" refers to the "three hot days" in the lunar calendar, which is the hottest period of the year. It can be understood in this way: "Fu" means that the weather is too hot, so it is better to stay still and not move.However, the reason why the dog days are called "fu" is because there are many cold factors involved. The three hottest days of the year are the thirty to forty days in the Central Plains. The three hottest days are calculated according to the lunar calendar, and are approximately from mid-to-late July to mid-to-late August in the Gregorian calendar. The time of the beginning of the dog days is not fixed every year, and the length of the middle dog days is also different. It is necessary to check the calendar to calculate. The date of the beginning of the dog days can be simply expressed by the four-character formula "Summer Solstice San Geng", that is, starting from the third "Geng" day after the summer solstice. The first dog days is 10 days, the middle dog days is 10 days or 20 days, and the last dog days is 10 days. The "ganzhi calendar" was popular in ancient my country. The days were recorded in a cycle using 60 different names formed by matching 10 heavenly stems with 12 earthly branches. Any day containing the character Geng is called Geng Day. The "Geng" in Geng day is the 7th of the 10 heavenly stems "Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui", and Geng day repeats every 10 days. Starting from the summer solstice, according to the arrangement of the Ganzhi calendar, the third Geng day is the first dog days, the fourth Geng day is the second dog days, and the first Geng day after the beginning of autumn is the last dog days. When there are 4 Geng days between the summer solstice and the beginning of autumn, the middle dog days lasts 10 days, and when there are 5 Geng days, it lasts 20 days. It seems that the early or late appearance of Gengri will affect the length of the dog days, so in some years the dog days last for 30 days, while in other years they last for 40 days. Isn't it hot after the dog days?As the saying goes, "The hottest time of the year is in the dog days," especially in cities, it feels like being in a huge steamer. After the beginning of the dog days, the humidity of the ground becomes higher, and it absorbs more heat every day and emits less heat. The heat on the surface accumulates, so it gets hotter day by day. When the dog days begin, the accumulated heat on the ground reaches its peak, and the weather is the hottest. In addition, there is more rain in summer and the air humidity is high. The heat capacity of water is much greater than that of dry air, which is also an important reason for the hot and humid weather.The subtropical high pressure strengthens in July and August. Under the control of the subtropical high pressure, the downward air flow inside the high pressure makes the weather clear and cloudless, which is conducive to sunlight and ground radiation warming, making the weather even hotter. Therefore, the climatic characteristics of the "dog days" are high temperature, low air pressure, high humidity and low wind speed. At this time, the human body naturally feels hot and stuffy. Generally speaking, after the dog days, the weather will gradually turn cooler, especially this year, it has been half a month since the beginning of autumn, so the temperature will definitely drop after the dog days this year, and the weather will gradually turn cooler. |
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