What is "three spring" and when is it?

Early spring: Also known as early spring and Meng Chun, it is the first month of the four seasons and beginning of spring. There are two solar terms: February 3 -5 in beginning of spring and February 18-20 in rainy season. ?

Mid-spring: February of the lunar calendar after Meng Chun. The vernal equinox has two solar terms: March 5-7 and March 20-22.

Late spring: it is the end of spring, also known as late spring, remnant spring and Yu spring. There are two solar terms: April 4-6 in Tomb-Sweeping Day and April 19-2 1 in Grain Rain.

Different regions have different "three spring" periods, namely, early spring, middle spring and late spring. Most of them are set as early spring from early February to early March, middle spring from early March to early April, and late spring from late April to early May.