Why is it easier to hail in hot summer? Why is it difficult to form hail in winter?

The formation of hail is a complicated process. Generally speaking, hail is accompanied by thunderstorm weather. This kind of cumulonimbus cloud comes from hail, also called "hail cloud", which is further developed from thunderstorm cloud. The rising temperature accelerates the evaporation of surface water, and about 79% of the earth's surface is ocean. The hot summer raises the temperature of water and promotes its evaporation, which also increases the humidity of the air. Hail embryos become bigger and heavier. When the updraft in the cloud couldn't hold it any longer, it plummeted from the cloud and became the hail we saw. Hail weather generally appears in the sultry afternoon in summer.

Hail is also called hail and snowball. It usually happens at the turn of spring and summer or in summer, and hail is more common in summer. Small to soybeans and mung beans, big to eggs and baseball, or even bigger.

In the atmosphere, a hot air stream containing a lot of water vapor is rapidly drilling upward. At this time, although the ground is hot, the altitude is still in severe winter, and the temperature is as low as MINUS 30℃. When hot air enters the sky, the water vapor it carries immediately condenses into water droplets, and the temperature drops sharply, forming small water droplets. When the temperature drops, small ice beads will form. These ice beads constantly absorb each other and condense into larger ice cubes, which are getting bigger and heavier. Finally, the airflow couldn't hold up and fell from the sky. This is hail.

Part of the water vapor gathers again. At this time, if the updraft is encountered again, the ice particles will continue to rise. In this way, the ice particles develop continuously in the process of rising and falling, and finally the ice particles with uncertain size are smashed down, forming the extreme weather of hail. This cycle can last many times. With each impact above and below freezing point, a new layer of ice is added to the frozen water drop until it becomes too heavy to be carried by the updraft. Then it will fall from the clouds to the ground. During the landing, the hail will melt. If it doesn't melt into water when it reaches the ground, we will see hail. If they all melt into water, we will see rain.