In which month did the weather in Hunan begin to get warmer?

April. Hunan has a warm climate with four distinct seasons. Under normal climatic conditions, it will not be warm until April in the solar calendar in Tomb-Sweeping Day. Hunan Province is located in the middle of China and the middle reaches of the Yangtze River. Because most of the area is south of Dongting Lake, it is named "Xiang", and because Xiangjiang, the largest river in the province, runs through the whole territory, it is called "Xiang" for short. Its capital is in Changsha.