What month is the dead of winter?

What month is the dead of winter? When is the dead of winter?

The duration of deep winter is between 39 and 59 days. That is, between 65438+ 10 and February.

On March 9th, because the ground receives less solar heat, the heat emitted at night exceeds the heat absorbed during the day. At this time, the heat stored on the ground has been exhausted. Because the heat can't make ends meet, the ground temperature drops gradually and the weather is getting colder and colder. If there is cold air at this time, the weather will become very cold. So "March 9th" weather is the coldest. Deep winter means that the ice is long and the snow is several feet deep.

The coldest weather:

As a method to record the cold winter, China folks divide the winter to 8 1 day in the future into 9 stages, with 9 days in each stage, which is called "Winter 99", which is often referred to as "Nine Cold Days". Among them, the solstice from 0/9 to 27 days after beginning of winter every year is called "Sanjiu".

In a year, the winter solstice is the shortest day, the angle between the sun's rays and the ground is the smallest, and the ground gets the least solar heat. It should be said that it is the coldest day in winter, but it is not, but it is "cold on March 9" Why is this?

Meteorologists say that the ground temperature is not only affected by the intensity of solar radiation, but also related to ground heat dissipation. Due to the long days and short nights from summer to the future, the angle between the sun's rays and the ground is large, and the ground gets the most heat, and the heat dissipation at night is less, so the heat storage on the ground is gradually increasing. In winter solstice, although the sun shines for a short time and the angle between the sun and the ground is the smallest, the heat stored on the ground in summer and autumn can be supplemented, so the weather is not necessarily very cold. Deep winter means ice.

Matters needing attention in three or nine days

1, mental health should be peaceful.

In winter, nature's stinging insects lurk and hide, using hibernation to recharge their batteries and prepare for the next spring's vitality. At this time, human metabolism is also in a relatively slow period. Therefore, winter health should be based on "hiding". "Hiding" means that people should keep quiet in winter.

It gets dark early in winter and the light time is short, which is also a reason why people are prone to depression. When night comes, the secretion of melatonin in the pineal gland of human brain is enhanced, which can affect people's mood, while light can inhibit the secretion of this hormone and keep people in a good mood.

2. Daily life and health are very important for cold protection.

Chinese medicine believes that "getting up early and staying up late to wait for the sun" is an important aspect of health care after winter. In other words, in cold winter, people should go to bed early and get up late. Going to bed early can nourish the body's yang, and it is best to get up after the sun comes out. At this time, the yang of human body rises rapidly, and the content of adrenocortical hormone in blood also rises gradually. Get up at this time with a clear head and wit. But it may be difficult for office workers to get up late, so try to go to bed early and don't stay up late.

3, room temperature should be kept constant.

If the room temperature is too low and people feel cold, it is easy to hurt Yuanyang. If the temperature is too high, the temperature difference between indoor and outdoor is large, and it is easy to catch cold when going out. Therefore, the room temperature should be kept between 65438 08℃ and 22℃. But don't close the doors and windows, open the windows for ventilation and keep the indoor air circulating.

4. Pay attention to back maintenance

Traditional Chinese medicine believes that the back is the main part of the bladder meridian of foot-sun in human meridians. The bladder meridian of Foot Taiyang can prevent the invasion of exogenous pathogens. Once a person has a cold, it will damage the yang, leading to upper respiratory tract infection or recurrence of old diseases. For the elderly, children and people with gastric and duodenal ulcers, cardiovascular and cerebrovascular diseases, it is particularly important to keep your back warm. After winter, these people had better wear close-fitting cotton vests.

5. Keep your feet warm

"Cold starts with the feet". The foot is the farthest part of the human body, with thin fat and poor warmth retention. Traditional Chinese medicine believes that plantar acupoints are closely related to human internal organs. If the feet catch cold, it will cause colds, abdominal pain, low back pain, dysmenorrhea and other diseases. Keep your feet warm. First, wear shoes to prevent them from being too tight, too loose and too thin. Second, use cotton socks as socks. Second, usually move your feet more to promote local blood circulation. Third, soak your feet with warm water every night before going to bed. The water temperature is 50-60 degrees Celsius, which can eliminate fatigue, keep out cold and prevent freezing, and promote sleep.