H unan enjoys the subtropical continental monsoon climate, which has three characteristics: First, rich light, heat and water resources, of which the high values are basically synchronous. Second, the variation between annual and inter-annual climate is huge, featuring cold winter and hot summer, warm spring with varied temperature, warm autumn with plunged temperature, rainy spring and summer, dry autumn and winter. The climate also has a huge interannual variation. Third, the area with the most obvious vertical climate change is the mountainous regions embraced on three sides by green hills, and the mountainous regions in western Hunan and southern Hunan are especially significant. Hunan’s annual sunshine time is 1,300 to 1,800 hours, thus this region has a great quantity of heat. The annual temperature is high, and the average annual temperature is between 15-18℃.
H unan is dominated by the winter monsoon in winter, and the landscape features, where the east, south and west are surrounded on three sides by mountains and the north is open, can help the cold air march into such regions, thus the average temperature in January is usually between 4-7℃. The frost-free period in Hunan lasts for 260-310 days, and most of the regions are 280-300 days. The average annual rainfall is between 1,200-1,700 mm, and Hunan is one of China’s provinces with abundant rainfall.