What is the dominant wind direction in Zhaoyang District of Zhaotong City?

Shanxi is located in the plateau and in the mid-latitude continental monsoon climate zone on the east side of Chinese mainland inland. The mountains in the territory fluctuate and the climate changes vertically. From north to south, north and south are long and narrow, and there is a significant difference between north and south. Broadly speaking, it belongs to a temperate semi-arid climate zone, ranging from Hengshan to the north of the Great Wall, between the south temperate semi-humid climate zone along Xiyang-Taiyue Mountain-Hejin line and the south Xiyang-Taiyue Mountain-Hejin in the middle of Hengshan Mountain. Overall characteristics: the climate in spring is changeable, the temperature in sand and summer is relatively high, the autumn is rainy, the time is short, mild and pleasant, the winter is long, and it is cold and dry.

The ground temperature in the whole province is characterized by Leng Xia heat in winter, annual temperature difference and temperature difference between day and night. The average annual temperature is 4 degrees. c？ 14E. The general trend is that from north to south, from basin to mountain, the temperature gradually decreases. For example, the annual average temperature in northern Shaanxi is 40C? 60C, Jinzhong, and southeastern Shanxi compare 8. c？ 10℃, Linfen, Yuncheng and Zhongtiaoshan in the southern valley, 12℃? 14 ℃. 1 month is the coldest month with an average monthly temperature of 2? 16℃, and the average temperature in the hottest July is 19.5. C. 27.5℃ The extreme minimum temperature in the whole province is 44.8. C (the top of Wutai Mountain) is extremely high.

The temperature is 42.7℃ (Yuncheng). Throughout the country, except for the inconvenience caused by sandstorms in spring, the climate in summer, autumn and winter in Shanxi can generally adapt to the cold in winter in the north and the hot in summer in the south, with great differences.

Save 2200 hours of sunshine. 2900 hours, sunshine rate 5 1 to 67 years, gradually increasing from north to south. In a year, the sunshine hours are the longest in May and June, and the shortest in June 65438+February.

The frost-free period in the province is 80 days to 205 days, and the corresponding temperature is from north to south. There are differences in the growth period of crops, and the frost-free period exceeds 100 days, mostly 3 months. One year in the north and two years in Jinnan.

Precipitation: Generally speaking, precipitation is large, decreasing from southeast to northwest. Except for a few mountainous areas, the annual precipitation is 400 mm? 650 mm, in the arid area of China. There are three rainy areas in the province, Zhongtiao Mountain and Taihang Mountain, with an average annual rainfall of more than 600 mm, and Wutai Mountain with an annual rainfall of 600? 700 mm, 3 Luliang area, the annual precipitation is about 600 mm, the third arid area, Datong basin, the annual precipitation is about111/4001,and the second Ding Xin basin, the annual precipitation is about 400? 450 mm, the annual precipitation of Luliang Mountain in the west of loess hilly and gully region is about 450 mm.

The annual precipitation is mainly concentrated from June to August in summer, accounting for more than 60% of the annual precipitation. Heavy rain and winter precipitation (snow) only account for 2% to 3% of the annual precipitation. Precipitation will increase in autumn and be scarce in spring. Taiyuan, 473.9 mm, has abundant water. Another feature of the annual average rainfall is that there are two water shortages, and the year of water shortage is 1/3.

Take the wind in Shanxi Province as an example, the winter months are mostly northerly or northwest winds, and the summer months are mostly southerly or southeast winds. Under different locations and topographical conditions, the surrounding wind direction will change. Generally speaking, the wind extends in the direction of mountains and valleys. Wutai Mountain is the highest mountain in the province, and the northwest wind blows all the year round. The wind in the north of the province is stronger than that in the south, and the wind in the plains is stronger than that in the mountains. The annual average wind speed is 2 to 4 meters per second. (Yangquan)

From southeast to northwest, the air distribution trend is low mountains and high humidity below valleys. The annual average relative humidity is 52% to 68%, and the annual precipitation trend in the whole province is consistent. Generally speaking, the humidity in summer and autumn is 68%. 80%; Dry in winter and spring, 44%? 60%。 The maximum relative humidity is generally before sunrise, and the minimum is around 15:00 in the afternoon.

Geographical environment and climatic conditions determine the types and characteristics of disasters in Shanxi: First, drought, known as "nine droughts in ten years". In recent 40 years, the annual incidence of drought has gradually increased, with five severe drought years: 1965, 1972, 1978, 1986, 199 1. In particularly severe spring, the frequency of spring drought is as high as about 50%, especially in the eastern region, and there are opportunities for drought and winter drought. Hail characterized by heavy hail and large-scale long hail disasters has a history of 40 years, and 1982 and 1984 are the two most severely affected years. Hail is mainly concentrated in 6 months to 8 months. "Hail attacks, hail disasters originated from hillsides, often from northwest to southeast.

Frost, hail caused by disaster. The first frost usually appears from September to 10, showing a regional distribution and gradually decreasing from north to south. Spring frost goes from south to north, from early April to early June.

Lightning is a common disastrous weather in Shanxi, causing strong winds and dry and hot winds. There are often sand blowing or sandstorms in the sand-blown areas in northern and central Shanxi, which are more common in spring.

Heavy rains, mostly in summer and autumn, flash floods and sudden river patterns. The flood gradually increased. The formation of these disasters is closely related to the lack of protection of the natural environment.