July 16th, which is tomorrow! This year’s dog days last for 40 days! So how is Dog Days calculated? Is this the hottest time of the year?
In fact, the time of Dog Day is not determined by the Meteorological Bureau, but is determined by the calculation of the twenty-four solar terms and the dates of stem and branch timing . The so-called "Three Volts" refers to the collective term for the first, middle and last days, which last for 30 or 40 days every year.
Since the time between the Beginning of Autumn and " Geng Day " is not fixed every year, the difference between each "Geng Day" is 10 days, so the time between the first and last days, that is, the middle days, will be longer or shorter, and some years It is 10 days, and in some years it is 20 days.
The China Meteorological Administration stated that by reviewing the historical observation data of more than 30 provincial capital cities across the country throughout the year (1991-2020), it was found that due to the vast territory of our country, the meteorological conditions in different regions at the same time are often very different, ranging from the maximum temperature to See, the dog days of summer are not necessarily the warmest time of the year in all areas.
For example, in Beijing, Shijiazhuang and Zhengzhou, which are located in the North China Plain, the maximum temperature reaches the highest period of the year starting from mid-to-late June, but drops after the onset of ambush. For here, the rainy season enters in mid-to-late July, and the rainfall actually lowers the maximum temperature.
Although the temperature in all areas does not soar to the highest during the Dog Days, year-round, the temperature and humidity index (taking into account the impact of temperature and relative humidity on human comfort) in most provincial capital cities is in the middle of the Dog Days. reached its peak during this period. This means that during the mid-voltage period, no matter whether the temperature is at its peak or not, it is indeed the period when the human body feels the hottest. Perhaps this is the true meaning of "hot in the mid-voltage period".
Will the 40-day Dog Days be hotter? Judging from the year-round meteorological observation data, the "heat" and length of the Dog Days are not related, but still depend on the specific weather conditions of the year. Therefore, it is too early to tell whether these dog days will be hotter.
According to the climate comfort level forecast released by China Meteorological Administration Public Meteorological Service Center , sultry weather will sweep across most of the south of North my country in the week before the headwind.
Sultry areas : It is expected that in the next week, a wide range of "sultry" weather will continue to occur in central and southern North China, Huanghuai, Jianghuai, Jianghan, Jiangnan, South China and the northeastern part of southwest China.
Extremely hot and muggy areas: It is expected that "extremely muggy" weather will continue to occur in Jianghuai, Jiangnan and most of South China in the next week. In addition, "extremely hot" weather will occur intermittently in parts of central and southern North China, western Huanghuai, eastern Sichuan, Chongqing and other places.
source Beijing Daily client | reporter Luo Qianwen
editor Kuang Feng
process editor Liu Weili
