What are the climatic characteristics of spring?

Beginning of spring, rain, sting, vernal equinox, Qingming and Grain Rain are six solar terms. In the three months of spring, the cold begins to fade, the climate gradually warms, and everything recovers and germinates. Climate change is characterized by wind. The characteristics of each solar term are described as follows:

1. beginning of spring is the beginning of spring on February 5th of the Gregorian calendar every year, at 3 15 degrees. Standing is the beginning, which means that from this day on, spring begins and everything has vitality.

The twenty-four solar terms in ancient China were divided into seventy-two periods, with one period every five days. In beginning of spring, the three periods of five days are "when the east wind thaws, when the insects start to vibrate, and when the fish get cold". This is the time when the east wind warms, and it is also the time when the earth begins to thaw after molting in spring. Five days after the spring, the stinging insects slowly woke up in the cave. Five days later, the ice in the river began to melt and the fish began to swim on the water. At this time, there are still broken borneol on the water, floating on the water like fish.

2. Rainwater is the rain around February 20th of the Gregorian calendar every year, at 330 degrees of the solar longitude, indicating that the winter with little rain has passed, and the rainfall began to increase gradually, that is, the snow dispersed into water.

At this time, the spring breeze blows all over, the ice and snow melt, the air is moist, and the rain is increasing, so it is called rain. People often say: "Spring blossoms, and rain is busy to send fertilizer." At this time, the frozen soil layer becomes shallow, the surface layer of the soil freezes at night, and it begins to return to pulp, which is beneficial to the greening of wheat and suitable for sowing. The three stages in the rainy solar term are: "One stage is that Rex sacrifices fish; Second, wait for Hongyan to come; Third-class grass sprouted. " It shows that in the rain solar term, otters began to fish and put the fish on the shore, as if they sacrificed first and then ate it. Five days later, the geese began to fly back to the north from the south; In another five days, in the "moist and silent" spring rain, every grass and tree will rise from the ground and begin to sprout. Since then, the earth has gradually begun to show a thriving scene.

3. Every year on March 5th of Gregorian calendar, at 345 degrees of the Yellow Meridian of the Sun. At this time, thunder rumbled, the temperature rose and hibernating animals began to be unearthed. Sting means hiding. Animals hibernate in the soil for the winter, which makes people sting. The next year, they came back to earth and came out again. In ancient times, people thought they were awakened by thunder, so they were called thunder. From the day of the sting, thunder can be heard, and insects and small animals hibernating underground are awakened by thunder and unearthed. At this time, the temperature and ground temperature are gradually rising, the soil has thawed, and spring ploughing can be started.

The three stages of fright are "peach blossom, Cang Geng (oriole) singing, and eagle turning into pigeon".

All kinds of insects are awakened when they hibernate in the soil, and eggs will begin to ovulate in winter, so it can be seen that fright is a solar term reflecting natural phenology. In the season of fright, some parts of China are already in the season of peach blossom red, plum blossom white, orioles howling and swallows coming, and most areas have entered the spring ploughing season. As an agricultural proverb in central China says, "Spring ploughing will not stop after the Frightening Festival." 4. The vernal equinox is the vernal equinox on March 2 1 day of the Gregorian calendar every year, at 0 degrees of the sun's longitude, which is the midpoint of spring. At this time, the sun is direct, and day and night are equal. After this day, the direct point of the sun gradually moved northward, and the days in the northern hemisphere became longer and shorter.

The average annual temperature is 8 degrees Celsius. The cold air in the north continues to invade, and the weather is warm and cold. In the last frost period, the seasonal water quantity in northern Shandong is still scarce, usually 5 ~ 10 mm, and the evaporation capacity increases obviously. Ten years and nine droughts are the norm. Divided into three solar terms, the weather is: "When the birds arrive; Second, wait for Lei Nai to make a sound; Third, wait for electricity. " In other words, after the vernal equinox, swallows will fly from the south, and it will thunder and lightning when it rains.

5. Qingming is on April 4th of the Gregorian calendar every year, at 15 degrees. At this time, the weather is sunny and the climate is warm, and the vegetation begins to sprout and turn green.

"Qingming" means that the climate is mild, the vegetation germinates, the apricot blossoms and peach blossoms bloom, giving people a fresh and clear feeling everywhere. The three stages of Qingming are as follows: "When tung flowers first bloom; Second, the vole became a quail; I'll see you when I wait for the rainbow. " That is to say, at this time, the white paulownia blooms first, then the happy voles in the shade disappear, all of them go to underground holes, and then the rainbow can be seen in the sky after the rain. In agricultural production, Qingming is an important solar term, and there is a saying that "Qingming is connected with Grain Rain, so don't delay immersion" and "plant melons and beans before and after Qingming"; There is also a saying in our city that "afforestation is not as good as Qingming". It can be seen that Qingming is a day that people should pay attention to, whether in rural areas or cities.

6. Grain Rain is called Grain Rain on April 2 1 day of the Gregorian calendar every year, which is at 30 degrees of the yellow meridian of the sun, which means that rain gives birth to hundreds of valleys. The rain increased obviously, and plants grew sturdily.

At this time of the year, there will be a continuous drizzle, and at this time, peach blossoms are in full bloom, so some people call the rain at this time peach blossom rain or peach blossom flooding. From the beginning of Grain Rain Festival, it is the beginning of busy farming. After Grain Rain, the temperature rose rapidly, and from that day on, the rainfall began to increase. Abundant rainfall has irrigated and moistened the newly planted seedlings and new crops, and the grain is growing well.

The three waiting periods in Grain Rain are as follows: "The first waiting period begins with a flat birth; The second time, pigeons blow feathers; The third class is Dai Ren's surrender. " After Grain Rain, rainfall increased, duckweed began to grow, then cuckoo began to remind people to sow, and then Dai Sheng birds began to be seen on mulberry trees.