Climatic characteristics of Hongshan Mountain

Hongshan District belongs to subtropical monsoon humid area, which is rich in light energy, heat and rainfall, with the same season of water and heat, four distinct seasons, obvious dryness and wetness, and a long frost-free period, and is suitable for the growth of vegetables and other crops, fishery and animal husbandry. Annual average sunshine hours 1950 ~ 2050 hours, total solar radiation106 ~/kloc-0 /cm2, frost-free period of 240 ~ 205 days, annual average precipitation1150. The abundant light, heat and water resources and their complementary advantages provide superior climatic conditions for the development of agriculture, fishery and animal husbandry. However, the distribution of light, heat and water in this area is uneven and varies greatly. The illumination difference between winter and summer is about twice, and the temperature changes greatly within one year. The average temperature in July is about 29℃, and the average temperature in 1 month is 4℃, which has the disadvantages of high temperature in summer and freezing in winter. Rainfall is generally concentrated in April-August, generally rainy in spring and summer, less in autumn and winter, and unevenly distributed in seasons. There is continuous rain in spring and heavy rain in summer, which is sudden and strong. The daily rainfall is as high as 248 mm, with moderate rainfall in autumn and winter and drought in winter. These disastrous weather are not good for agricultural production.

The annual average temperature in Hongshan area is 16.3℃, the agricultural boundary temperature is higher than 5℃ for 283 days, higher than10℃ for 235 days, higher than 20℃ 136 days, the frost period is 236 days, the annual average sunshine hours are 2087 hours, and the annual average rainfall is1655. In addition, the Yangtze River is dotted around the lakes in the northeast and west of the area, and the terrain is slightly undulating. Therefore, the lake effect, ridge effect and urban effect are all obvious. The comprehensive influence of these climatic factors has created favorable conditions for vegetable production in Hongshan District.