What season does hail usually occur?

Hail disasters in China mostly occur in spring, summer and autumn. Compared with the summer with strong convection, the frequency and intensity of hail disasters in spring are higher. On the one hand, cold and warm weather meet frequently in spring, and the convection is strong; In addition, the height of 0℃ layer is high in midsummer, and ice crystal particles may melt before landing.

In most parts of China, 70% hail time is concentrated in 13- 19, and the most is between 14- 16.

Hail is a kind of solid precipitation. Like rain and snow, falling from the clouds. It is hard spherical, conical or irregular solid precipitation that falls to the ground from strong cumulonimbus clouds. People everywhere call it "hail", "frozen egg", "cold child" and so on. Common hail is the size of a bean, but it is also like an egg or a larger one, sometimes a fusion of several ice particles.

Hail clouds consist of water droplets, ice crystals and snowflakes. Generally, there are three layers: the bottom layer is above 0℃ and consists of water droplets; The middle layer has a temperature of 0℃ to -20℃ and consists of supercooled water droplets, ice crystals and snowflakes. The temperature of the top layer is lower than -20℃, which is basically composed of ice crystals and snowflakes.

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