Why is spring rain as expensive as oil instead of summer rain, autumn rain and winter rain?

This is because there is little rain in spring, which is the season when everything recovers, so many animals and plants need rain to moisten them. Spring is the period when overwintering crops, such as winter wheat, turn green to milk maturity, which requires a lot of water. Corn, cotton, etc. From sowing to emergence, we also need enough water, which makes the spring drought more prominent. If there is rain at this time, it will naturally be particularly precious, so there is a saying that "spring rain is as expensive as oil".

The spring drought in North China is more serious. The spring rain accounts for 10- 15% of the annual precipitation, and in some places it is less than 10%. If there is little rainfall in autumn and winter, the temperature rises rapidly in spring, windy days and strong evaporation, it is often easy to form drought in autumn, winter and spring.

Extended data:

The climate in South China is different from that in South China. In early summer, the weather becomes warmer. Due to the combined action of warm and humid air and cold air, the rainfall in these areas has increased, and there is often a saying that "it rains in Qingming Festival". Around April every year, the pre-flood season appears in all parts of South China, and then the rain belt advances from south to north. So there are more spring rains in the south.