Youyu County
Youyu County, also known by its Chinese name Youyuxian, is a county under the administration of the prefecture-level city of Shuozhou, in the northwest of Shanxi Province, China. It borders Inner Mongolia to the north and west.
Youyu County 
    右玉县 Yuyu  | |
|---|---|
![]() Youyu in Shuozhou  | |
![]() Shuozhou in Shanxi  | |
| Coordinates: 39°59′20″N 112°28′01″E | |
| Country | People's Republic of China | 
| Province | Shanxi | 
| Prefecture-level city | Shuozhou | 
| Area | |
| • Total | 1,987 km2 (767 sq mi) | 
| Population  (2020)[1]  | |
| • Total | 88,212 | 
| • Density | 44/km2 (110/sq mi) | 
| Time zone | UTC+8 (China Standard) | 
| Youyu County | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Traditional Chinese | 右玉縣 | ||||||||
| Simplified Chinese | 右玉县 | ||||||||
  | |||||||||
| Former names | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Shanwu | |||||||||
| Traditional Chinese | 善無 | ||||||||
| Simplified Chinese | 善无 | ||||||||
  | |||||||||
| Yanmen Commandery | |||||||||
| Traditional Chinese | 雁門郡 鴈門郡  | ||||||||
| Simplified Chinese | 雁门郡 | ||||||||
| Literal meaning | Yanmen Pass Commandery | ||||||||
  | |||||||||
History
    
Shanwu,[2] south of present-day Youyuxian, was the seat of Yanmen Commandery during the Qin and Western Han.[3] The post moved to Yinguan southeast of present-day Shuozhou under the Eastern Han and further south to Daixian under the Kingdom of Wei.[2]
Geography
    
Elevations are generally higher in the south of the county, in which flows the Cangtou River (苍头河); Youyu reaches a north-south extent of 67.7 km (42.1 mi) and east-west width of 45.7 km (28.4 mi). The Great Wall demarcates the northwestern border with Inner Mongolia's Liangcheng and Horinger counties; within the province, Youyu borders Zuoyun County to the east, Shanyin County and Pinglu District to the south.
Climate
    
Youyu has a monsoon-influenced, humid continental climate (Köppen Dwb), with cold and very dry winters, and warm, humid summers. The monthly 24-hour average temperature ranges from −14.4 °C (6.1 °F) in January to 19.5 °C (67.1 °F) in July, and the annual mean is 3.93 °C (39.1 °F). June thru September accounts for over three-fourths of the 410 millimetres (16 in) of annual precipitation. Due to the high elevation and dry climate, the diurnal temperature variation averages 16 °C (29 °F) annually.
| Climate data for Youyu County (1971−2000) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year | 
| Record high °C (°F) | 9.6 (49.3)  | 
15.4 (59.7)  | 
20.5 (68.9)  | 
32.5 (90.5)  | 
33.4 (92.1)  | 
32.8 (91.0)  | 
34.4 (93.9)  | 
34.0 (93.2)  | 
33.1 (91.6)  | 
26.8 (80.2)  | 
19.5 (67.1)  | 
11.3 (52.3)  | 
34.4 (93.9)  | 
| Average high °C (°F) | −4.9 (23.2)  | 
−1.1 (30.0)  | 
5.5 (41.9)  | 
14.5 (58.1)  | 
21.4 (70.5)  | 
25.2 (77.4)  | 
26.3 (79.3)  | 
24.6 (76.3)  | 
19.9 (67.8)  | 
13.3 (55.9)  | 
4.2 (39.6)  | 
−2.9 (26.8)  | 
12.2 (53.9)  | 
| Daily mean °C (°F) | −14.4 (6.1)  | 
−10.5 (13.1)  | 
−2.6 (27.3)  | 
6.1 (43.0)  | 
13.2 (55.8)  | 
17.7 (63.9)  | 
19.5 (67.1)  | 
17.6 (63.7)  | 
11.8 (53.2)  | 
4.7 (40.5)  | 
−4.3 (24.3)  | 
−11.6 (11.1)  | 
3.9 (39.0)  | 
| Average low °C (°F) | −22.4 (−8.3)  | 
−18.6 (−1.5)  | 
−10.5 (13.1)  | 
−2.9 (26.8)  | 
3.7 (38.7)  | 
9.2 (48.6)  | 
12.7 (54.9)  | 
11.1 (52.0)  | 
4.4 (39.9)  | 
−2.5 (27.5)  | 
−11.1 (12.0)  | 
−19 (−2)  | 
−3.8 (25.1)  | 
| Record low °C (°F) | −40.4 (−40.7)  | 
−36.8 (−34.2)  | 
−29.3 (−20.7)  | 
−17.4 (0.7)  | 
−12.6 (9.3)  | 
−2.1 (28.2)  | 
3.0 (37.4)  | 
0.2 (32.4)  | 
−8.0 (17.6)  | 
−14.0 (6.8)  | 
−32.2 (−26.0)  | 
−34.1 (−29.4)  | 
−40.4 (−40.7)  | 
| Average precipitation mm (inches) | 2.2 (0.09)  | 
3.5 (0.14)  | 
9.9 (0.39)  | 
17.5 (0.69)  | 
34.0 (1.34)  | 
60.2 (2.37)  | 
107.0 (4.21)  | 
98.0 (3.86)  | 
50.9 (2.00)  | 
18.7 (0.74)  | 
7.0 (0.28)  | 
1.5 (0.06)  | 
410.4 (16.17)  | 
| Average precipitation days (≥ 0.1 mm) | 2.3 | 3.4 | 5.4 | 4.7 | 6.4 | 9.8 | 14.1 | 13.0 | 8.7 | 5.6 | 3.6 | 2.2 | 79.2 | 
| Source: Weather China | |||||||||||||
References
    
    Citations
    
Bibliography
    
- www.xzqh.org (in Chinese)
 - Hymn of Youyu County Spirit - Cursive Script
 - Li Shizhen (2017), Hua Linfu; et al. (eds.), Ben Cao Gang Mu Dictionary, Vol. II: Geographical and Administrative Designations, Berkeley: University of California Press, ISBN 9780520291966.
 - Xiong, Victor Cunrui (2009), Historical Dictionary of Medieval China, Historical Dictionaries of Ancient Civilizations and Historical Eras, No. 19, Lanham: Scarecrow Press, ISBN 9780810860537.
 

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