Suining City is located in the Asian monsoon area, belonging to the subtropical humid monsoon climate in Sichuan Basin. It has a mild climate, abundant rainfall, four distinct seasons and a significant monsoon climate. The frost free period is long in winter and spring. The hot summer and the same season of rainfall and heat provide sufficient light, heat and water conditions for spring crops, but drought and flood alternate. It is rainy in autumn and cloudy in winter, with less sunshine and higher humidity. The frost free period is 283 ~ 300 days. The climate difference between Fujiang River Valley and hilly area is obvious. The annual average temperature is 16.7-17.4 ℃, the annual extreme maximum temperature is 39.5 ℃ - 40.4 ℃, the annual extreme minimum temperature is - 3.8 ~ - 4.8 ℃, the annual average rainfall is 887.3 ~ 927.6 mm, which is 867.7 mm different from the minimum rainfall. The average annual total solar radiation is 87.41 ~ 93.36 kcal / cm2, and the annual average sunshine hours are 1300.4 ~ 1328.1 hours The average evaporation is 910.7-1128.3 mm, the annual average relative humidity is 80-82%, the annual average wind speed is 0.6-1.8 M / s, the average frost period is 64.6-81.6 days, and the average frost free period is 283-300 days. There are foggy days throughout the year, with more in autumn and winter than in spring and summer.