Folklore says it will snow after beginning of spring.

It is normal for it to snow after beginning of spring. According to the definition of meteorology, it is not spring yet, so it is not cold in late spring.

Snow is a normal weather phenomenon after beginning of spring, and it is easier to see it in the cold wave in spring. After the arrival of beginning of spring, the cold and warm air became more active and more water vapor was transported to the north. Abundant water vapor naturally brings greater opportunities to see snow in the north.

In ancient China, beginning of spring was divided into three periods: "when the east wind thawed, when the stinger began to vibrate, and when the fish was frozen." The flower letter corresponding to the three seasons is "waiting for the Spring Festival, waiting for cherries, waiting for spring." It is said that the east wind warms and the earth begins to thaw. Five days after beginning of spring, hibernating 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.

However, it should be noted that these phenomena mainly refer to the Yellow River Basin. Lunar calendar is the traditional calendar of Han nationality in China, also known as summer calendar and lunar calendar. It is a kind of lunar calendar. It takes the change period of the moon phase as the length of a month and the return year of the sun as the length of a year. By setting leap months, the average calendar year adapts to the tropic year. The twenty-four solar terms are calculated according to the solar calendar. Is determined by the position of the earth in its orbit around the sun.

Starting from the annual winter solstice, every 15 degree is a solar term. Therefore, the 24 solar terms have roughly fixed dates in each month of the solar calendar. The ancients defined 24 solar terms to guide farming. It is the general name of the twelve solar terms and twelve qi in a year, and it is the date when the sun passes through twenty-four specific positions on the ecliptic in a tropical year (calculated by solar calendar). Beginning of spring is the first of the 24 solar terms in the lunar calendar. Astronomically speaking, it is when the sun reaches longitude 3 15. Beginning of spring is also one of the important traditional festivals in China. "Li" means "start". Since the Qin Dynasty, China has always regarded beginning of spring as the beginning of the Meng Chun season. The so-called "a year's plan lies in spring", spring is full of flowers, birds and flowers are fragrant; Spring is growth, cultivation and sowing.