Geography and Climate
Yumen has a cold desert climate (Köppen BWk), with long, cold winters, and very warm summers. The monthly daily average temperatures ranges from −9.8 °C (14.4 °F) in January to 21.7 °C (71.1 °F) in July, and the annual mean is 7.13 °C (44.8 °F). The range between daytime and nighttime temperatures is high throughout much of the year. Sunny weather and low humidity dominates year-round, although rainfall is more frequent in summer.
| 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 (27.0) |
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 (58.24) |
| Average low °C (°F) | −15.4 (4.3) |
−12.2 (10.0) |
−5.5 (22.1) |
1.8 (35.2) |
7.6 (45.7) |
11.9 (53.4) |
14.0 (57.2) |
12.8 (55.0) |
7.5 (45.5) |
0.5 (32.9) |
−6.7 (19.9) |
−13 (9) |
0.28 (32.50) |
| 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 (2.63) |
| % humidity | 53 | 42 | 35 | 31 | 31 | 41 | 47 | 45 | 41 | 40 | 45 | 54 | 42.1 |
| 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 |
| 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 |
| Source: China Meteorological Administration | |||||||||||||
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