What solar term is the occurrence of low temperature and rainy thunderstorm?

Vernal equinox and solar terms. According to homework help's information, "the occurrence of low temperature and rainy weather" refers to the continuous invasion of cold air into southern China, which will lead to cold weather in spring, and it refers to the solar term of vernal equinox. The vernal equinox is one of the 24 solar terms and the fourth solar term in spring. When the sun reaches 0 degrees, it will be in March of Gregorian calendar 19-22 every year.