Impact of Climate Change on the Growth of Typical Crops in Karst Areas: A Case Study of Guizhou Province

Table 6

Consecutive rainless days: drought grade standards.

Season	Region	Number of consecutive rainless days in different drought grades (days)
		Light drought	Moderate drought	Severe drought	Extraordinary drought
Spring (Mar–May)	North China	15∼30	31∼50	51∼75	>75
	South China	10∼20	21∼45	46∼60	>60
Summer (Jun–Aug)	North China	15∼30	31∼50	51∼75	>75
	South China	10∼20	21∼45	46∼60	>60
Autumn (Sep–Nov)	North China	10∼20	21∼30	31∼50	>50
	South China	5∼10	11∼15	16∼30	>30
Winter (Dec–Feb)	North China	20∼30	31∼60	61∼80	>80
	South China	15∼25	26∼45	46∼70	>70