Geographical environment of Zhangye city

Zhangye City is located in the middle of Hexi Corridor, bordering Qinghai-Tibet Plateau in the south, Badain Jaran Desert in the north, Jiuquan City in the west and northwest, and Wuwei City in the east and northeast, which belongs to a typical continental grassland desert climate. The weather is mainly controlled by the westerly circulation in the middle and high latitudes and the W ring of polar cold air mass, with dry climate, cold winter, short and warm summer, less and concentrated precipitation and windy and dusty weather. Zhangye Meteorological Observatory is located in Xiguan Street, Zhangye City, with geographical parameters: east longitude 1000 26', north latitude 380 56' and altitude: 1482.7 meters.

Average temperature: 7.3℃

Extreme maximum temperature: 39.8℃

Extreme minimum temperature: -28.2 1℃

Extreme maximum surface temperature: 72.9℃

Extreme minimum surface temperature: -32.7℃

Average annual precipitation: 130.4㎜

Maximum daily precipitation: 34.0mm.

Annual average evaporation: 2002.5㎜.

Maximum snow thickness: 10 ㎝.

Annual average station pressure: 852.0 hectopascals

Annual average relative humidity: 52%

Minimum relative humidity: 0%

Annual average water pressure: 6.30 hectopascals

Maximum freezing depth: 1 13㎝.

Annual average sunshine hours: 3065.6 hours.

Annual average thunderstorm days: 3.4 days.

Average annual sandstorm days: 3.9 days.

Annual average number of foggy days: 0.2 days.

Annual average wind speed: 2.0m/s

Dominant wind direction: southeast wind.

Ten-minute average maximum wind speed: 28.0m/s, the wind direction is northwest.