Rain is the 24 traditional solar terms in China (the 24 traditional Chinese solar terms The second solar term. "Rain" marks an increase in rainfall and a rise in temperature. When the solar term of rain comes, the scene of spring begins to bloom: the river thaws, wild geese return to the north, and plants turn green. Therefore, as the weather gets warmer and rainfall increases, the solar term of rain is regarded as a key period for irrigating farmland.