Characteristics of rainwater solar terms

Rain is the second of the 24 solar terms. At this time, the temperature rises, the snow melts and the precipitation increases. Let me take you to underst

Characteristics of rainwater solar terms

Rain is the second of the 24 solar terms. At this time, the temperature rises, the snow melts and the precipitation increases. Let me take you to understand the characteristics of solar terms in rainy season.

Characteristics of rain solar terms: Rain falls on February 18-20 in Gregorian calendar, and the solar terms start on the rainy day and end on March 4-5 in Gregorian calendar before the fright day. The direct point of the sun is approaching the equator from the southern hemisphere. At this time, in the northern hemisphere, the sunshine hours and intensity are increasing, the temperature is rising rapidly, and the warm and humid air from the ocean is becoming active and gradually moving northward. At the same time, cold air is not to be outdone in the weakening trend, frequently competing with warm air, unwilling to quit the dominant position and refusing to accept residual cold [2].

It began to rain, and it gradually increased. The rainy season means that it begins to rain and the rainfall gradually increases. In the Yellow River Basin, the birthplace of the twenty-four solar terms, the weather was cold before it rained, but there were snowflakes flying and the rain was falling, which was unpleasant. After the rain, the temperature can generally rise above 0℃, with less snow and more rain. However, in the warm south, even in the dead of winter, rainfall is not uncommon. The average temperature in most parts of southern China in this period is above 10℃, peaches and plums are in bud, and cherries are in full bloom. It has indeed entered a climatic spring. In addition to a few years, the frost period has come to an end. It is timely to graft fruit trees and plant trees. After a dry winter, there are many droughts in spring all year round in South China, especially in the western part of South China, where "spring rain is as expensive as oil". In addition, the invasion of cold wave will cause strong cooling and snowstorm, which will do great harm to the old, weak and young animals. These should pay special attention to prevention.

Rain not only indicates the beginning and increase of rainfall, but also indicates the rise of temperature. It was cold before it rained. After the rain, people obviously feel that spring has returned to the earth, warming bloom and filling the world with spring. The fresh breath lifts the body and mind.

The cold and snow time has passed in most parts of the country, and it began to rain, and the rainfall gradually increased, which is conducive to the greening or growth of overwintering crops. It is necessary to pay close attention to the field management of overwintering crops and make good preparations for seed selection, spring ploughing, fertilization and other spring ploughing and sowing.

The second feature of the Rain Festival is that when rain comes, plants will sprout. From the sixth day of July to the second day of September, "the river flows in September, and cattle are cultivated everywhere on September 9 and September 19", which means that most areas in the northwest, northeast and southwest plateaus are still in the cold winter, and many other areas are experiencing or have completed the transition from winter to spring. Urged by the spring breeze and rain, the vast rural areas have begun.

However, in the rainy season, cold air activities in the north are still frequent and the weather is changeable. Since we talk about the frequent cold air activities in the next season, we can't help but mention what people often say about "spring cover". This is the principle of dressing and keeping in good health put forward by the ancients according to the characteristics of spring climate change. In early spring, when the sun is shining and the climate is getting warmer, people gradually go to cotton and wear light clothes. But at this time, it is still cloudy and cold in the north, and the temperature changes greatly. Although the rainy season is not as cold as the winter, the human body panel has become relatively loose, and the resistance to the evil of wind and cold will be weakened, so it is easy to get sick by evil. So it makes sense to pay attention to "spring cover" at this time. This changeable weather is easy to cause people's mood swings and even anxiety, which affects people's physical and mental health, especially those with hypertension, heart disease and asthma. In order to eliminate these unfavorable factors, besides continuing to cover them in spring, we should also adopt positive psychological exercise methods. Maintaining emotional stability plays a very important role in physical and mental health.

After the rain, the spring breeze warms up, and pathogenic bacteria and viruses are easy to spread with the wind, so infectious diseases tend to break out in spring. Everyone should protect themselves, pay attention to exercise, enhance their resistance and prevent diseases.

In the rainy solar terms, the humid atmosphere gradually rises, and dew and frost appear in the morning. Therefore, in view of such climate characteristics, diet recuperation should be based on conditioning the spleen and stomach, expelling wind and removing dampness. Because the climate is cold at this time, it can be supplemented appropriately, such as honey, jujube, yam and tremella, which are all suitable for this solar term.

At this time, the atmospheric circulation is in the adjustment stage, and the general trend of climate characteristics throughout the country is from cold in late winter to warm in early spring.

Characteristics of solar terms in rainy season in southwest China and Jiangnan area

During rainy days, except for the spring scenery in southern Yunnan, most places in the southwest and south of the Yangtze River are still a scene of early spring: the sun is warm, it is wet and cold in the morning and evening, the fields are green and the springs are warm.

According to the division standard of four seasons, spring begins when the daily average temperature is ≥ 10℃-≤22℃ for five consecutive days. Generally speaking, the real "spring" in these places will come in late March, which is the "vernal equinox" season a month later. But there are also some special cases, such as Wuhan February 10, Changsha February 1 1, Nanchang February 1 1, and Nanjing February 2004 13. The time is fully advanced 1 month.

According to the multi-year average rainfall of 65438 10 and February, Wuhan is 43.4 mm and 58.7 mm, Changsha is 66. 1 mm and 95.2 mm, Nanchang is 74.0 mm and 100.7 mm, and Fujian is 48.0 mm and 86.6 mm, which shows the rainfall ratio of the above places in February.

2 South China

In the rainy season, South China is full of spring and flowers are in full bloom.

The annual average temperatures in the following cities in South China in February are: Guangzhou 14.5℃, Nanning 14. 1℃, Haikou 18.7℃. The average precipitation in the above cities in February was 69.4 mm, 42.6 mm and 35.0 mm respectively. Although the rainfall is several times more than that in the middle and lower reaches of the Yellow River, there is still water shortage due to high temperature and large evaporation. Especially in southern South China and Hainan Island, the rainfall during this period is still relatively small, and spring droughts often occur. If the average temperature is lower than 10℃ under the influence of strong cold air, it is very unfavorable for early rice seedling raising.

If we say that in these areas, "beginning of spring" is the first movement "Sonata" in spring: spring is budding and spring is chilly. After the rain, it entered the second movement of spring "variation": the temperature rose, and it was cold and warm. In the rainy season, "the seven or nine rivers open and the geese come" is a landscape in late winter and early spring.

The middle and lower reaches of the Yellow River and North China

At this time, the confrontation between cold and warm air did not bring about the sudden drop of temperature and the flying of snowflakes, but the arrival of spring breeze and spring rain. At this time, the average temperature in this area has risen above 0℃, and even the extreme maximum temperature during the day can reach above 20℃. There is no condition of snowfall, even if the ancestors named it "rain" after the first spring rain, it is also appropriate.

In rainy season, wheat enters the stage of turning green, and at this time, wheat has higher requirements for water. At this time, it is the least rainy time of the year. According to the surface climate data of China in 197 1 ~ 2000, the average rainfall in Shijiazhuang, Taiyuan and Beijing in February was only 7.4 mm, 5.2 mm and 4.9 mm respectively, which is really "spring rain is as expensive as oil".

Northwest and Northeast China

In the rainy season, the northwest and northeast of China are still not out of the category of winter. Judging from the average temperature in February, the monthly average temperatures in Lanzhou, Xining, Urumqi and Shenyang are-65438 0.0℃, -3.9℃, -9.7℃ and -6.9℃ respectively. It can be seen that these places have not got rid of the cold in winter, the weather is still dominated by cold, and the precipitation is dominated by snow.