Anhui is located in the transition zone between warm temperate zone and subtropical zone, with warm and humid climate and distinct four seasons.
The annual average temperature in the whole province is between 14- 17℃, the monthly average temperature is 0-4℃, and the active accumulated temperature above 1 0℃ is 4620-5300℃ in July. When a strong cold wave crosses the border, the temperature often drops sharply, even freezing the overwintering crops. The frost-free period is about 200 ~ 250 days.