Hail fell in the hot tropical rain forest in Kuala Lumpur, Malaysia today. Why is there hail in the weather all year round and in summer?

Hail is the most common in summer, but not in winter.

The process of hail formation is simple. First, the formation of precipitation. Precipitation, that is, the water on the surface evaporates into steam, rises in hot air, while the troposphere height rises 1000m, and the temperature drops by 6 degrees, which means that the temperature will be very low at high places. When the water vapor is cold and there are enough condensation nuclei (such as particles in the atmosphere), it will condense into liquid water. Because of the low temperature, ice will generally form, but it will generally melt during the falling process, thus forming precipitation.

The formation of hail is the same as this process. It is also that water vapor condenses when it is cold on the way up, but because it is in summer, the sunshine is stronger, the temperature is higher, and the hot air flow rises more violently, it can bring water vapor to a higher height, thus condensing into enough ice, but not enough to melt when it falls, so it will form hail.

The lightning mentioned by the subject is nothing more than the process of excessive convection in the atmosphere, violent friction between clouds, static electricity generation and then release.

Strong winds are caused by uneven heat and cold on the ground. The air pressure is higher in cold places and lower in hot places, so the air will flow from the places with high air pressure to the places with low air pressure, thus forming the wind.

So these phenomena (especially hail) are normal in summer.