It hails in May, is it normal?

Hail is normal in May; Because hail is produced in the process of convective movement between cumulonimbus clouds and strong air. Therefore, the air is relatively stable in winter, the temperature difference between the upper and lower parts is not as big as that in summer, and the vertical convection of the air is not as strong as that in summer, so it is not easy to have cumulonimbus clouds. Hail is difficult to form.

In summer, the sun is scorching the earth, and there is a hot airflow with a lot of water vapor in the atmosphere, which rises rapidly to the sky. At this time, although it is very hot on the ground, it is still very cold in the sky. When hot and humid air enters the sky to cool down, a small part of the water vapor it carries condenses into small water droplets; When water droplets continue to get cold, they are frozen into small ice crystals. Small ice crystals fall from the sky, and at the same time, many small water droplets with a temperature lower than 0℃ are mixed, and these small water droplets freeze on themselves and become ice particles; Sometimes, in the process of descending, we encounter a strong wind blowing from the bottom up. This wind is called updraft and brings it back to the high altitude. These small ice particles cool again in the sky, collide with small water droplets with a temperature below 0℃, and fuse together, freezing the small water droplets on themselves, so their surfaces are covered with a layer of ice. That's it, it kept churning in the air, constantly colliding with small water droplets with a temperature below 0℃, and once again putting on one coat made of ice, until it reached a certain weight, the updraft could no longer carry it to the high altitude, so it plummeted from the sky-it rained. Pick up the hail and break it with a knife. Its longitudinal section is clear, and it is several layers of ice coat and snow coat worn by hail in the sky.