What's the difference between Grain Rain and rain?

Rain, the second of the twenty-four solar terms, is located on the fifteenth day of the first month of each year (February 18-20 in Gregorian calendar), and the sun reaches 330 degrees of the yellow meridian. Rain is the qi of the first month in the twenty-four solar terms of the lunar calendar, which means that rainfall begins and gradually increases. Grain Rain is the sixth solar term among the 24 solar terms and the last solar term in spring. Every year from April 19 to April 2 1, when the sun reaches 30, it is Grain Rain, and the cold wave weather basically ends in Grain Rain, with the temperature rising and precipitation increasing obviously. Rain, like Grain Rain, light snow and heavy snow, is a solar term reflecting precipitation.