Phenological characteristics of vernal equinox

The phenological characteristics of the vernal equinox are as follows:

During the vernal equinox, most of northwest China, northern North China and northeast China are still in the transitional stage of winter and spring, with many sunny days and windy days, and it is warm and cold at first sight. Dust storms or sand blowing weather, late spring cold and spring drought often occur in northwest, northern North China and most parts of Northeast China.

In the cold spring and early spring, when the temperature rises rapidly, it will continue to be low for a while. This weather phenomenon is called late spring cold. In the south, the main influence of late spring cold is the rotten seedlings of early rice. In northern China, it will affect the growth of peanuts, vegetables and cotton, and even lead to the phenomenon of dead seedlings of wheat.

Introduction of vernal equinox:

The vernal equinox is one of the 24 solar terms and the fourth solar term in spring. The longitude of the sun reaches 0, and the festival is held on March 19-22 of the Gregorian calendar every year. The vernal equinox is of great significance in astronomy. On this day, the northern and southern hemispheres are divided equally day and night. Since then, the direct position of the sun has continued to shift from the equator to the northern hemisphere. The days in the northern hemisphere are longer than the nights, while the southern hemisphere is the opposite.

Climatically, there are also obvious characteristics. In addition to the Qinghai-Tibet Plateau, Northeast China, Northwest China and North China, China has entered a beautiful spring.