What does it mean to snow at the vernal equinox?

Snowing at the vernal equinox means that the temperature is not high and the weather will be cold this spring. This is a common saying circulating in rural areas, which means that if it snows on the vernal equinox and solar terms, it will be detrimental to farmers' spring ploughing and spring sowing.

The ancients were not so strict about the division of spring as they are today. The ancients thought that when beginning of spring arrived, spring would come. When long summer arrives, summer will arrive, so the period from beginning of spring to long summer (9 days) is spring, and the vernal equinox is at the midpoint of spring (45th day after beginning of spring).

at the vernal equinox, the sun shines almost directly on the equator of the earth, and it is almost as long as day and night all over the world. After the vernal equinox, the direct point of the sun began to enter the northern hemisphere, and the days were long and the nights were short in all parts of the northern hemisphere. Except the Qinghai-Tibet Plateau, Northeast China, Northwest China and North China, China has entered a bright spring. On the vast land, willows are green, yingfei grass grows, wheat is jointing, and rape blossoms are fragrant.

Air pressure

The East Asian trough is obviously weakened in the spring equinox solar term, and the trough ridge activity in the westerly belt is obviously increased. From Mongolia to the northeast, there are often low-pressure activities and cyclone development, and the low-pressure movement leads cold air to the south, and there are many strong winds and sand-blowing weather in the north. When the long wave trough moves eastward, affected by the intersection of cold and warm air masses, there will be continuous rainy and cold weather in late spring, with obvious cold and hot conditions.

Temperature and precipitation

During the vernal equinox, the average daily temperature in China rises steadily to above ℃ except in the alpine mountain area where winter lasts all year round and the area north of 45 north latitude. At this time, the severe cold has passed away, and the temperature has risen rapidly, especially in North China and Huanghuai Plain. The daily average temperature almost rises above 1℃ at the same time as the rainy Jiangnan area along the Yangtze River and enters a bright spring.