There are obvious differences in climate between the mountainous area in the northwest and the plain and hilly area in the southeast of Deyang City. The main climatic characteristics are: mild climate, four distinct seasons, abundant rainfall, long frost free period and obvious dry winter. In spring, the cold air activity is frequent, the temperature rises unstable, the precipitation is less, and spring drought often occurs; in summer, there is no hot summer, more rainstorms and often floods; in autumn, the temperature drops rapidly, often with continuous rain; in winter, it is warm and less rainy, more cloudy days, and more foggy days. The annual average temperature is 15 ℃ - 17 ℃, the average temperature of the coldest month (January) is 5 ℃ - 6 ℃, and the average temperature of the hottest month (July) is 25 ℃. The annual average sunshine hours are 1000-1300 hours, and the daily average temperature is higher than 0 ℃ all the year round, and the accumulated temperature of ≥ 0 ℃ is 5500-6000 ℃. The extreme maximum temperature is 37.3 ℃ and the extreme minimum temperature is - 7.6 ℃. The annual total precipitation is 900-950 mm, and the precipitation gradually decreases from northwest to Southeast. The annual precipitation of northwest is more than 950 mm, the central part is 900-950 mm, and the southeast part is less than 960 mm. Most of the precipitation is from May to October, accounting for 87-89% of the annual precipitation. The maximum annual precipitation is 1400-1500 mm, and the minimum is 530-630 mm. The annual average frost free period is 270-290 days. The average number of snowfall days per year is 1-3 days, mostly in the middle of winter. Northerly wind prevails in plains and hills, with an annual average wind speed of 1.4-1.6 M / s, with the largest wind speed in spring. The average wind speed from March to may ranges from 1.6 to 2.0 M / s, and the maximum wind speed reaches 14-19 M / s. The minimum monsoon is in autumn and winter, with an average wind speed of 0.9-1.5 M / m from October to February.