The summer heat is the twelfth solar term among the twenty-four solar terms and the last solar term in summer. The sun's yellow meridian is 120 degrees, and it will cross the Gregorian calendar on July 22-24. "Summer heat" means heat, and great summer heat means extreme heat. The summer heat is hotter than the summer heat, which is the fiercest and hottest solar term in a year, and the "damp-heat steaming" reaches its peak at this time. Climatic characteristics of the great summer: high temperature and scorching heat, frequent thunderstorms and typhoons.