Three dog days is the hottest time of the year. Entering the three dog days is like entering a steamer. Does the barbecue mode upset many people? So when does the three dog days in 2018 start? When does it start?
The dog days of 2018 start from July 17, 2018.
Dog days in 2018: 40 days in total
July 17, 2018 - July 26, 2018, the first fall, 10 days
July 27, 2018 - August 15, 2018, zhongv, 20 days
August 16-25, 2018, last 10 days
How to determine the date of Sanfu
First fall, according to China's calendar law, this is the beginning of a real summer day. The people often say: heat in three volts, cold in three nineties. The three dog days are the season with the highest temperature and humidity in a year, which are divided into the first, the middle and the last, in which the first and the last are fixed for 10 days, some are 10 days, some are 20 days.
At the beginning of the incubation period, it is called in or out, and at the end of the incubation period, it is called out. The number of medium voltage days depends on the time of lodging. Generally, the number of days of lodging before July 28 is 20 days, the number of days of lodging on July 29 is 10 days.
What's the hottest day
The hottest stage of three dog days: Zhongfu
1. When it comes to which one of the three volt days is the hottest, we need to mention the folk saying "cold in Sanjiu, hot in Zhongfu", which means that the hottest day of the year belongs to the "three volt", and the "three volt" is the hottest. After the end of the day, the weather began to cool.
2. First of all, as the surface humidity increases after the fall, the heat absorbed by the ground every day is more, the heat emitted is less, and the heat of the surface layer accumulates, so it gets hotter day by day. Entering the middle voltage, the heat accumulated on the ground reaches the highest value, and the weather is the hottest.
3. In addition, there is more rain in summer, and the air humidity is large. The heat capacity of water is much larger than that of dry air, which is also an important reason for the sultry weather in three rainy days.
4. In July and August, the subtropical high pressure was strengthened. Under the control of the subtropical high, the downdraft inside the high pressure made the weather clear and cloudless, which was conducive to the sunshine, the ground radiation increased temperature, and the weather was even hotter.
5. After entering the final days, the weather is gradually cool. It's cooler in the morning and evening. It's still hot at noon. Each area will be different. Because the last fall is after the beginning of autumn, even the so-called "autumn tiger" is hot in the daytime and cool in the morning and evening.
Air defense and disease control in three rainy days
Human is a constant temperature animal. Human body temperature will change with the change of external temperature. In summer, the natural Yang is sufficient, and the temperature and humidity are relatively high. In order to adjust the environment temperature, the human body needs to open and close the sweat pores in time to discharge the excess heat and humidity from the body. But now we have made a kind of artificial environment air conditioner artificially. When we suddenly enter the room with very low temperature from the hot sun, the sweat pores that normally excrete sweat will suddenly close. This kind of closure is very sudden. In the process of closure, it will cause two consequences: one is to close the cold air in the body together; the other is to interrupt the normal sweating function.
As we all know, perspiration is a detoxification process of the human body. In summer, with the help of external Yang, the human body was supposed to expel all kinds of cold and damp toxins from the body, but the intervention of air conditioning disrupted this process. It is not only the incomplete detoxification, but also the external cold brought into the body together. Therefore, people at this stage are easy to get air conditioning disease. The disease is a cold in summer. Because of the cold in the body, the symptoms are all over muscle pain, joint pain, headache, no sweat, loss of appetite, and even all over cold, fever. In fact, at this stage of fever, it has been shown that the human body starts to mobilize the strength of the body to expel cold evils, which is an instinctive reflection of human body self preservation. All we have to do at this time is sweat. In the environment without air conditioning, through sweating, the abnormal closed hairs will be turned on again to discharge the cold and humidity in the body. As long as the body returns to normal sweating, the body temperature will drop, and the discomfort will gradually disappear. At this time, do not have a fever on the infusion, human health, is not much good.