Yumen City

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Yumen
玉门市
County-level city
Location of Yumen City (pink) within Jiuquan City (yellow) and Gansu
Location of Yumen City (pink) within Jiuquan City (yellow) and Gansu
Coordinates: 39°50′N 97°34′E / 39.833°N 97.567°E / 39.833; 97.567Coordinates: 39°50′N 97°34′E / 39.833°N 97.567°E / 39.833; 97.567
Country People's Republic of China
Province Gansu
Prefecture-level city Jiuquan
Elevation 1,507 m (4,944 ft)
Time zone China Standard (UTC+8)
Postal code 735200
Area code(s) 0937

Yumen (simplified Chinese: 玉门; traditional Chinese: 玉門; pinyin: Yùmén, literally, "Jade Gate,") is a city in western Gansu province, China. It is a county-level city with a population of 116,194 (2000), and is part of Jiuquan "prefecture-level city" (a multi-county administrative unit). It is located on the Silk Road and is best known for its oil production.

It is not the same place as the famous Yumen Guan or Jade Gate frontier-pass of ancient times, the entrance to the old Silk Roads, which was situated not far to the west of Dunhuang. Although both Yumen City and Yumen Gate are within Jiuquan, the latter is some 400 kilometres (250 mi) to the west from the former.

Geography and climate[edit]

Yumen has a cold desert climate (Köppen BWk), with an annual total precipitation of 67 millimetres (2.64 in), the majority of which occurs in summer. Winters are long and cold, with a 24-hour average temperature of −9.8 °C (14.4 °F) in January, while summers are very warm, with a July average of 21.7 °C (71.1 °F); the annual mean is 7.13 °C (44.8 °F). The diurnal temperature variation reaches or exceeds 15 °C (27 °F) for much of the year. With monthly percent possible sunshine ranging from 67% in March to 80% in October, the city receives 3,214 hours of bright sunshine annually.

Climate data for Yumen (1971−2000)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °C (°F) −2.8
(27)
1.7
(35.1)
9.0
(48.2)
17.5
(63.5)
23.3
(73.9)
26.9
(80.4)
28.6
(83.5)
27.9
(82.2)
23.0
(73.4)
15.2
(59.4)
5.8
(42.4)
−1.2
(29.8)
14.58
(58.23)
Average low °C (°F) −15.4
(4.3)
−12.2
(10)
−5.5
(22.1)
1.8
(35.2)
7.6
(45.7)
11.9
(53.4)
14.0
(57.2)
12.8
(55)
7.5
(45.5)
0.5
(32.9)
−6.7
(19.9)
−13
(9)
0.28
(32.5)
Precipitation mm (inches) 1.0
(0.039)
1.3
(0.051)
4.1
(0.161)
4.3
(0.169)
6.7
(0.264)
12.9
(0.508)
13.9
(0.547)
12.5
(0.492)
4.8
(0.189)
2.1
(0.083)
2.1
(0.083)
1.1
(0.043)
66.8
(2.629)
Avg. precipitation days (≥ 0.1 mm) 1.8 1.4 2.3 2.3 2.4 5.0 5.8 4.6 1.9 1.1 1.9 2.3 32.8
 % humidity 53 42 35 31 31 41 47 45 41 40 45 54 42.1
Mean monthly sunshine hours 221.7 214.1 248.5 274.8 314.5 312.0 311.0 306.7 292.4 276.2 229.7 212.0 3,213.6
Percent possible sunshine 75 72 67 69 71 70 68 72 78 80 77 73 72.7
Source: China Meteorological Administration