Spring few rain frequency online map of China's
agricultural meteorological disasters
was derived from the 《National
Agricultural Atlas of the People's Republic
Compared with the same period of the year, one of the following conditions is less rainfall,
which is expressed by frequency: 1. Monthly decrease of more than 25% for three consecutive
months; 2. Monthly decrease of more than 50% for two consecutive months; 3. Monthly decrease
of more than 80%.