Why is there much lightning in spring and summer?

This is because the warm and humid airflow is active, the air is humid, and at the same time, the solar radiation is strong, and the air near the ground is constantly heated up, forming a strong convection up and down, which is prone to lightning.

Winter is controlled by continental cold air mass, the air is cold and dry, the solar radiation is weak, the air is not easy to form violent convection, and lightning rarely occurs.