Is the heat in 2020 the hottest time? How many days is it usually hot in hot summer?

Introduction: The summer solar term is the hottest period in a year during the dog days, so is the summer in 2020 the hottest time? How many days is it usually hot in summer The heat of the great summer heat should not be underestimated. For my own health, please look at the taboos I brought.

The summer solar term in 2020 begins on July 22nd, 2020 16:36:44 and ends at 9:06 on August 7th, 2020.

The hot summer is the hottest period of the year, not a day. Its duration is from July 22nd to August 7th.

Why is it so hot in summer?

Every year on July 23rd or 24th, when the sun reaches longitude 120, it is a great summer heat. The great summer heat is the hottest period of the year. Therefore, there is a proverb in "Great Summer": "The great summer is unbearable, and you know what you are doing, and you are barking. Grasping both, heatstroke prevention is the most important. "

Perhaps many people will wonder why summer heat is the hottest period in a year. Isn't it the summer solstice? The summer solstice is when the direct point of the sun reaches the northernmost point-23 of the Tropic of Cancer. 5° N is the maximum period of solar altitude angle in most parts of China. Although it is the period with the largest solar radiation, it is not the period with the highest temperature. Why?

Because solar radiation and atmospheric warming have two links, they are affected by many factors.

Link 1: Solar radiation warms the surface;

Link 2: Ground radiation warms the atmosphere. Both links need time to reach the maximum, so the appearance of the highest temperature in the atmosphere will be delayed.

There are many factors in the process of two links. Among the many factors that affect atmospheric warming, the most important is weather conditions, less rainfall, sunny weather and high atmospheric temperature.

From the summer solstice, the surface absorbs heat and the temperature keeps rising, and it is not until the summer heat that the temperature rises to the highest.

Taboos in summer heat

Outdoor attention

1. During high temperature in summer, the content of ultraviolet rays in the sun is high, especially at noon, when the outdoor temperature is high, you should try to avoid being exposed to the outdoor for a long time, so as to avoid heatstroke caused by ultraviolet rays.

2. During the high temperature in summer, if you want to go out, you must prepare a sun hat or umbrella, wear sunglasses, and use sunscreen properly to avoid activities at high temperature to avoid heatstroke.

3. When arranging labor or physical exercise, we should avoid the scorching sun and pay attention to strengthening protection, especially for the elderly, whose organ function declines and their water content is less than that of young people. Therefore, hot weather is more harmful to the elderly.

Indoor pressure

1. During the summer heat, you should ensure adequate sleep in your daily life. You shouldn't sleep when you are too sleepy. You should start to fall asleep when you feel slightly tired, and don't do strenuous exercise before you fall asleep.

2. Avoid being in an air-conditioned room for a long time, and appropriately raise the temperature of the air conditioner at home, preferably around 26 C, to avoid excessive temperature difference between indoor and outdoor, which is easy to catch a cold.

In summer, many people like to sleep naked, mistakenly thinking that it will be cool, but it is wrong. It is best to wear pajamas when sleeping in summer, which can absorb sweat well and prevent catching cold at the same time.

4. Don't stay up for a long time. The peak of human yang is from 1 1 to 3 am. If you don't fall asleep at this time and stay up late, it will affect the growth of yang in the body and the health of the liver. Therefore, be careful not to stay up late in summer, and you'd better fall asleep before 1 1.