Neijiang City belongs to subtropical humid monsoon climate. Affected by the basin and the natural environment, it has the characteristics of mild climate, abundant rainfall, sufficient light and heat, and long frost free period. It is warm in winter and hot in summer, with moderate rainfall. The average temperature is 15 ℃ - 28 ℃, the average temperature in January is 6 ℃ - 8 ℃, and the average temperature in July is 26 ℃ - 28 ℃. The maximum temperature can reach 41 ℃, the minimum temperature is - 5.4 ℃, and the active accumulated temperature is about 5598 ℃. The annual average total solar radiation is 89.6 kcal / cm2, the annual total sunshine hours are 1100-1300 hours, and the frost free period is 330 days. The number of frost days in a year is generally about 4-8 days. The main disastrous weather is drought, with alternating drought and flood; in spring, summer, autumn and winter, low temperature, wind and rainstorm occur from time to time, and continuous rain is obvious. The annual temperature has obvious phenomenon of dry winter and spring drought, at the same time, the phenomenon of summer drought and summer drought occurs from time to time. In history, there is a saying that "there is a great drought in ten years, a small drought in five years, two droughts in three years, and drought in flower arrangement every year.". The annual relative temperature is about 80%. The annual rainfall of 1000 mm is more than or equal to that in summer, accounting for 60% of the annual rainfall. The high temperature period is basically consistent with the rainy season, accounting for 17% in spring and 4% in winter.