How many months does spring mean?
Spring is one of the four seasons. As far as solar terms are concerned, spring begins in early spring and ends in long summer. Twenty-four solar terms are the product of ancient farming civilization in China, and the division of four seasons begins with "four stands".
In the historical development, cultural exchange and communication, four solar terms (vernal equinox, autumnal equinox, summer solstice, winter solstice) reflecting the return movement of the direct point of the sun were all over the pre-Qin period. The division of the four seasons in the west is based on the dichotomy, that is, spring is divided into beginning of spring.
As the ice and snow melt, the water level of the river rises. In spring, plants begin to sprout and grow, and many flowers bloom. Hibernating animals wake up, many animals with eggs for the winter hatch, and birds begin to migrate, leaving the wintering ground for breeding grounds. Many animals are in estrus during this period, so China also calls spring the season of "the revival of everything". The changes of temperature and biology in spring also affect people's psychology and physiology.
For agriculture, spring is the season for sowing many crops, and it is also the time for harvesting many crops.
climate
From March to April every year, the air pressure in Indo-China Peninsula and Southwest China first drops, attracting warm south wind and alternating with cool northeast wind.
At this time, the continental anticyclone gradually weakened, and Dong Chang moved to the East China Sea or Ryukyu Islands, so that the northerly winds that arrived in Hong Kong passed through a wider warm sea.
In spring, the northern hemisphere of the earth began to tilt towards the sun, receiving more and more direct sunlight, so the temperature began to rise. In spring, plants begin to sprout and grow, and many flowers bloom. Hibernating animals wake up, many animals with eggs for the winter hatch, and birds begin to migrate, leaving the wintering ground for breeding grounds. Many animals are in estrus during this period, so China also calls spring the season of "the revival of everything".
Because hot air began to move northward, while cold air often lingered, in addition, the temperatures of land, water and air all rose at different speeds. Spring is rainy season in many places in southern China, but it is rainy and dry in northern China. There are often strong storms in Europe and tornadoes in North America.