Generally speaking, there is no bad time to visit Hunan. Different seasons offer distinctly different views. 
 
Hunan has a continental, subtropical, seasonally-humid climate with four distinct seasons. It has abundant sun, long frost-free periods, and abundant rainfall. The annual sunshine duration is 1300-1800 hours. The annual average temperature is 16℃-18℃. It is frost-free 260-310 days a year. Annual rainfall is 1200-1700mm.