Spring few rain frequency online map of China's agricultural meteorological disasters was derived from the National Agricultural Atlas of the People's Republic of China.
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%.
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