The lowest and highest temperatures in Xi.

By the end of 65438+February in 2022, the historical minimum temperature in Xi 'an is -2 1.2℃, and the annual extreme maximum temperature is 43.4℃.

Xi belongs to warm temperate semi-humid continental monsoon climate. Four distinct seasons, mild climate and moderate rainfall. Spring is warm, dry and windy; Summer is hot and rainy, and there are many thunderstorms and windy weather; Autumn is cool, the temperature drops rapidly, and autumn showers are obvious; Winter is cold, foggy and less rainy and snowy.

The warm monsoon climate is located between Asia, the largest continent, and the Pacific Ocean, and the thermal properties of land and ocean are significantly different. In summer, the Eurasian continental depression is connected, the ocean subtropical high extends westward and advances northward, and the southeast monsoon from the subtropical high in the North Pacific brings abundant precipitation. The northwest monsoon from the powerful Mongolian high in winter affects the local area. Because the wind shear meets the requirements of monsoon, it is a monsoon climate.

Topography: Xi 'an's geological structure also spans Qinling geosyncline fold belt and North China platform. The great fault at the northern foot of Qinling Mountains occurred during the Yanshan Movement 654.38+300 million years ago. Since the Neogene about 3 million years ago, the neotectonic movement in the Qinling geosyncline fold belt south of the great fault has been extremely active, and the mountains have fallen sharply from north to south, creating the Qinling Mountains.

At the same time, the Weihe fault depression, which belongs to the North China platform to the north of the great fault, continued to subside, and the Weihe plain was formed under the joint action of aeolian loess cover and Weihe alluvial. ?

The altitude difference in Xi 'an ranks first among the cities in China. The Qinling Mountains, with its steep and beautiful peaks, and the wide and flat Weihe Plain have clear boundaries, which constitute the main landforms of Xi 'an.

The main peak of Qinling Mountain is 2000-2800 meters above sea level, of which the main peak of Taibai Mountain in the southwest is 3867 meters above sea level, which is the highest peak in the central part of the mainland. Weihe plain is 400-700 meters above sea level, of which the lowest point of Weihe river bed in the northeast is 345 meters above sea level. The urban area of Xi is built on the second terrace of Weihe Plain.