In which season does it often hail in China?

Hail in China mostly occurs in spring, summer and autumn, accounting for about 70% of the total from April to July. Severe hail disaster areas include southern Gansu, Longdong, the yinshan mountains, Taihang Mountain, western Sichuan and Yunnan Province.

Hail is a kind of solid precipitation. It is a spherical or conical ice block, which consists of transparent layers and opaque layers alternately. Generally, the diameter is 5 ~ 50 mm, and the maximum can reach 10 cm or more. The greater the diameter of hail, the greater the destructive power. Hail often destroys crops and threatens the safety of people and animals. It is a serious natural disaster, and many countries with severe hail disasters have carried out artificial hail suppression experiments.

Hail comes from strong convective convective clouds (cumulonimbus clouds). The updraft in the cloud is stronger than that in the general thunderstorm cloud. Small hailstones are formed by hail embryos colliding with supercooled water droplets several times up and down in convective clouds, and fall to the ground when the updraft in the clouds can't support them. Heavy hail is produced in a thunderstorm cloud with strong updraft and rich liquid water.

References:

Baidu encyclopedia entry? hail