Cold dew is the characteristic of solar terms. In our country, cold dew is traditionally regarded as a symbol of the cold weather. The solar term of Mid-Autumn White Dew is "dew condensation and white", and it is already "dew gas is cold and will condense into frost" by the time of cold dew in season and autumn. Let's share the characteristics of the cold dew solar terms. Come and have a look.
The characteristics of cold dew solar terms 1 The temperature drops rapidly.
The rapid temperature drop is a feature of the cold dew solar terms. After the autumn wind and autumn rain brought by a strong cold air, it is common for the temperature to drop by 8℃ and 10℃. However, most of the stormy weather does not last long (except in West China). Controlled by cold and high pressure, it is warm during the day and cool at night, and it is often crisp in autumn during the day.
The average temperature distribution varies greatly.
10, the regional difference of average temperature distribution in China is obvious. In South China, the average temperature is above 22℃ in most areas, and it is higher in Hainan, above 25℃, and it has not yet come out of summer. Jianghuai and Jiangnan are generally between 15℃-20℃, and the southeast, north China and Huanghuai are between 8- 16℃. At this time, the average temperature in parts of northwest and north-central northeast has reached below 8℃. The average temperature in some plateau areas of Qinghai Province is even below 0℃.
Cold dew and three chrysanthemums have yellow flowers.
In ancient China, cold dew was divided into three stages: "One stage for Hongyan guests; Second, when the sparrow enters the water, it becomes a clam; Three chrysanthemums have yellow flowers. " In this solar term, the geese moved southward in a word or herringbone queue; In the cold of late autumn, all the birds disappeared. The ancients saw a lot of clams suddenly appearing on the seashore, and the stripes and colors of shells were very similar to those of birds, so they thought it was birds. The third stage of "chrysanthemum begins to blossom" means that chrysanthemums have been widely opened at this time.
Characteristics of cold dew solar terms 2 1, foot warmth
As the saying goes, "cold dew does not show your feet." Because it is really cold after the cold dew, there is no heat in early autumn. Mushrooms who like to wear sandals should pay attention, and the sandals worn in summer should be put away. After all, it is very important to keep your feet warm, so be careful. Hot water can be used to soak feet before going to bed, which can not only prevent chill from entering the body, but also make the blood vessels of the feet dilate and blood flow accelerate, improve the nutrition of the skin and tissues of the feet, reduce the occurrence of lower limb soreness and relieve fatigue.
2. Add clothes at the right time
Don't wear cool clothes in summer after the cold dew, you should add clothes at the right time, especially the elderly, children and people with weak physical fitness should pay attention to cold and warmth, and gradually add clothes. Of course, seasonal clothes should not be added too quickly. It is best to match the thickness, mainly to keep warm, and "not wearing single clothes" is also an important point for cold dew health. Cold dew season, in daily life, but also reasonable arrangements.
3. Go to bed early and get up early
After the cold dew, you will find that the yang of the human body begins to converge and settle. At this time, people should pay attention to maintaining the yang, so they should make appropriate adjustments in their daily life. In autumn, the days are getting shorter and shorter, and the nights are getting longer and longer. Experts say that going to bed early can conform to the convergence of yang, and getting up early can stretch the lung qi. Therefore, it is necessary to "go to bed early and get up early" in autumn cold dew health care. In order to avoid the formation of thrombosis, we should conform to the solar terms and take care of ourselves at different times to ensure health.
The characteristics of cold dew solar terms 3 Cold dew is a solar term reflecting the characteristics of climate change, and "cold" refers to cold. From the literal meaning, it can be seen that the weather has obviously turned cold at this time. Compared with the white dew, the temperature has dropped a lot, and the dew on the ground is colder, which is likely to become frozen dew, so it is called cold dew. Generally, the cold dew season is on the 8 th or 9 th of the Gregorian calendar 10 every year. On the day of the cold dew, the sun reached the longitude of the yellow meridian 195 degrees. At noon that day, the sun's shadow was measured with a standard gauge, and its length was 8 feet 2 inches, which is equivalent to 2.0 18 meters today. At night, the bucket handle of the Big Dipper points to the direction of E, that is, the northwest. This stage is usually in September of the lunar calendar.
After the cold dew, the cold air in the north has a certain influence, and most parts of China are under the control of cold high pressure, and the rainy season is over. The weather is often warm in the day and cool in the night, with clear skies and Wan Li, which is very beneficial to the autumn harvest. Thunderstorms have disappeared in most parts of mainland China, and only parts of Yunnan, Sichuan and Guizhou can still hear thunder. The precipitation in North China 10 is generally only half or less than that in September, while it is only a few millimeters to more than 20 millimeters in northwest China. Drought and lack of rain often bring difficulties to timely sowing of winter wheat and become one of the main limiting factors for high yield of dry land wheat.
At this time, it is still autumn rain in Hainan and Southwest China, and rainy weather will also occur in Jianghuai and Jiangnan in a few years, which has a certain impact on autumn harvest and autumn planting.
"If you don't pick cotton in cold dew, you can't blame heaven for frost.". We should pay close attention to harvesting cotton when the weather is fine, and we can take it back when the temperature is not too low when the temperature drops early. The single-season late rice in Jianghuai and Jiangnan is about to mature, and the double-season late rice is filling. Attention should be paid to intermittent irrigation to keep the field moist.
The southern rice-growing areas should also pay attention to preventing the harm of "cold dew wind". North China should pay close attention to sowing wheat. At this time, in case of drought and little rain, we should try our best to build up soil moisture and grab the soil moisture for sowing, so as to ensure that the sowing will be finished before and after first frost, and we must not passively wait for the rain to lead to planting early crops and late wheat. Before and after the cold dew is the suitable sowing date for direct seeding rape in the Yangtze River basin, and the variety arrangement should be that the cabbage type variety should be sown first and then the cabbage type variety. Green manure sowing in the south of Huaihe River should be cleaned up, and those that have emerged should be cleaned and drained to prevent waterlogging.
The swelling of sweet potato tubers in the North China Plain gradually stops, and the probability that the temperature is below 10℃ or lower in the morning is gradually increasing. We should pay close attention to the harvest according to the weather conditions and try to finish it before the early frost, otherwise the potato tubers will be "hard-hearted" due to freezing for too long in the ground, which will reduce the value of eating, feeding and industrial use, and cannot be stored or used as seeds.