The natural and geographical differences between Xi and Chengdu.

Xi is located in the north of China. It belongs to temperate monsoon climate, with low temperature in winter, and the temperature in Leng Yue is below 0 degrees Celsius. Less precipitation, the annual precipitation is less than 800 mm.

Chengdu is located in the southwest of China, with subtropical monsoon climate and high temperature, especially in winter when the temperature in Leng Yue is above 0 degrees Celsius. There is a lot of precipitation, and the annual precipitation exceeds 800 mm.

1.Xi 'an is located in Guanzhong Basin in the middle of Weihe River Basin, with east longitude 107.40 ~ 109.49 degrees and north latitude between 33.42 ~ 34.45 degrees, bordering Weihe River and Loess Plateau in the north and Qinling Mountain in the south. Xi 'an Plain belongs to warm temperate zone and semi-humid continental monsoon climate, with four distinct seasons: cold, warm, dry and wet. Winter is cold, windy, foggy and less rainy and snowy; Spring is warm, dry, windy and the climate is changeable; Summer is hot and rainy, drought is prominent, and there are many thunderstorms and strong winds; Autumn is cool, the temperature drops rapidly, and the autumn rain is obvious. The annual average temperature is 13. 0℃~ 13.7℃, coldest 65438+ 10, monthly average temperature-1. 2℃~ 0.0℃, the hottest average temperature in July is 26. 3℃~ 26.6℃, and the annual extreme minimum temperature is -265433. The annual precipitation is 522. 4 ~ 7 19.5 mm, increasing from north to south. July and September are two obvious precipitation peak months. The annual sunshine hours are1646.1~ 2114.9 hours, and the dominant wind direction varies from place to place. Xi 'an is the northeast wind, Zhouzhi and Huxian are the west wind, Gaoling and Lintong are the northeast wind, Chang 'an is the southeast wind, and Lantian is the northwest wind. Meteorological disasters include drought, continuous rain, rainstorm, flood, urban waterlogging, hail, gale, dry hot wind, high temperature, lightning, dust, fog, haze, cold wave and low temperature freezing injury.

2. Chengdu is located in the middle of Sichuan Province, in the west of Sichuan Basin, between east longitude 102 54'~ 104 53' and north latitude 30 05' ~ 3126', with east-west length 192 km and north-south width/kloc-. Chengdu is located in the transition zone from the western Sichuan Plateau to the Sichuan Basin, and has its own unique climate resources: First, the climate in the east and west is different. Due to the disparity between the east and the west of Chengdu, with the rapid increase of altitude, the heat decreased sharply, so the pattern of warm in the east and cool in the west appeared. Moreover, in the mountainous areas around the western basin, the temperature difference between mountains at the same time can be several degrees, and even there are many climate types from bottom to top, such as warm temperate zone, temperate zone, cold temperate zone and cold zone. This vertical change of heat has created very favorable conditions for Chengdu to develop agriculture, especially diversified economy. Second, the winter is wet and cold, the spring is early, the frost-free period is long, the four seasons are distinct and the heat is rich. The annual average temperature is about 16℃, the annual average active accumulated temperature ≥ 10℃ is 4700 ~ 5300℃, and the frost-free period is 278 days. The first frost period generally appears at the end of 1 1, and the final frost period is generally in late February, with Leng Yue in winter (66. The weather with the lowest temperature below 0℃ mainly occurs in the middle and late February of 65438+and the early October of 65438+ 10, and a small part occurs in the middle and late October of 65438+ 10. The average temperature is 1 ~ 2℃ higher than that in the middle and lower reaches of the Yangtze River at the same latitude, and it enters spring half a month earlier. Third, there is little spring rain in winter, rainy in summer and autumn, and abundant rainfall. The average annual precipitation is 900 ~ 1300mm, and the annual precipitation changes little. The ratio of the maximum annual precipitation to the minimum annual precipitation is about 2: 1. Fourth, light, heat and water are basically in the same season, and the combination of climate resources is reasonable, which is very conducive to biological reproduction. Fifth, the wind speed is small, and the wind speed in the vast plains and hilly areas is1~1.5m/s; There are few sunny days, the sunshine rate is between 24% and 32%, and the average annual sunshine hours are

1042 ~ 14 12 hours, and the annual average total solar radiation is 83.0 ~ 94.9 km/cm2.