Why is Grain Rain the last solar term in spring?

Grain Rain is the last solar term in spring.

Grain Rain is the sixth of the 24 solar terms. Every year from April 19 to April 2 1 day, when the sun reaches 30 degrees of the ecliptic, it is Grain Rain, which comes from the old saying "Rain makes a hundred valleys". At the same time, it is also the best time to sow and transplant seedlings. Grain Rain has high temperature and frequent rainfall. According to meteorologists, Grain Rain is the last solar term in spring, and the arrival of Grain Rain solar term means that the cold wave weather is basically over and the temperature rises faster, which is very beneficial to the growth of cereal crops.