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Lancang Lahu Autonomous County (澜沧拉祜族自治县) is located in southwestern Yunnan below the Tropic of Cancer, spanning latitude 22°01'−23°16' N and longitude 99°29'−100°35' E and an area of 8,807 km2 (3,400 sq mi), making it the second-largest county in the province in terms of area. It has an international border with Burma's Shan State totaling 80.563 km (50.060 mi) in length. It is heavily mountainous and situated among the Hengduan Mountains, with the elevation ranging from 2,516 m (8,255 ft) at Mount Malihei (麻栗黑山) in Xincheng Township (新城乡) to 578 m (1,896 ft) in Yakou Township (雅口乡).
Lancang County contains elements of both a tropical wet and dry climate and a humid subtropical climate (Köppen Aw and Cwa, respectively), and is generally humid. Summer is long and there is virtually no "winter" as such; instead, there is a dry season (December thru April) and wet season (May thru October). A drier heat prevails from February thru early May before the onset of the monsoon from the Indian Ocean. The monthly 24-hour average temperature ranges from 15.0 °C (59.0 °F) in January to 24.6 °C (76.3 °F) in June, while the annual mean is 20.86 °C (69.5 °F). Rainfall totals about 1,580 mm (62 in) annually, with nearly 70% of it occurring from June to September, when relative humidity averages above 85%. With monthly percent possible sunshine ranging from 24% in July to 70% in February, the county receives 2,116 hours of bright sunshine annually.
| Climate data for Lancang County (1971−2000) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 27.9 (82.2) | 33.2 (91.8) | 33.8 (92.8) | 36.3 (97.3) | 36.8 (98.2) | 35.1 (95.2) | 33.6 (92.5) | 33.4 (92.1) | 33.0 (91.4) | 33.0 (91.4) | 30.4 (86.7) | 29.3 (84.7) | 36.8 (98.2) |
| Average high °C (°F) | 23.8 (74.8) | 25.9 (78.6) | 29.1 (84.4) | 30.7 (87.3) | 30.4 (86.7) | 28.9 (84) | 27.7 (81.9) | 28.5 (83.3) | 28.4 (83.1) | 27.2 (81) | 24.6 (76.3) | 22.9 (73.2) | 27.3 (81.1) |
| Daily mean °C (°F) | 15.0 (59) | 16.5 (61.7) | 19.4 (66.9) | 22.2 (72) | 24.1 (75.4) | 24.6 (76.3) | 24.0 (75.2) | 24.3 (75.7) | 23.8 (74.8) | 22.0 (71.6) | 18.7 (65.7) | 15.7 (60.3) | 20.9 (69.6) |
| Average low °C (°F) | 6.3 (43.3) | 7.2 (45) | 9.8 (49.6) | 13.7 (56.7) | 17.8 (64) | 20.3 (68.5) | 20.4 (68.7) | 20.2 (68.4) | 19.2 (66.6) | 16.9 (62.4) | 12.9 (55.2) | 8.5 (47.3) | 14.4 (57.9) |
| Record low °C (°F) | −1.0 (30.2) | 1.9 (35.4) | 2.6 (36.7) | 6.6 (43.9) | 12.0 (53.6) | 16.3 (61.3) | 15.6 (60.1) | 15.3 (59.5) | 11.2 (52.2) | 7.8 (46) | 2.9 (37.2) | −1.4 (29.5) | −1.4 (29.5) |
| Average rainfall mm (inches) | 11.8 (0.465) | 16.0 (0.63) | 20.1 (0.791) | 44.8 (1.764) | 161.4 (6.354) | 273.6 (10.772) | 329.2 (12.961) | 293.0 (11.535) | 191.2 (7.528) | 135.6 (5.339) | 79.4 (3.126) | 20.7 (0.815) | 1,576.8 (62.08) |
| Average rainy days(≥ 0.1 mm) | 2.8 | 3.7 | 4.7 | 10.6 | 17.5 | 25.0 | 27.8 | 25.7 | 20.9 | 15.6 | 9.6 | 4.4 | 168.3 |
| Averagerelative humidity(%) | 75 | 68 | 63 | 65 | 74 | 84 | 87 | 86 | 85 | 84 | 83 | 81 | 77.9 |
| Mean monthlysunshine hours | 216.6 | 225.7 | 257.7 | 231.0 | 205.3 | 126.7 | 97.9 | 123.3 | 142.9 | 157.6 | 153.1 | 178.1 | 2,115.9 |
| Percentpossible sunshine | 64 | 70 | 69 | 61 | 50 | 31 | 24 | 31 | 39 | 44 | 46 | 53 | 48 |
| Source #1: China Meteorological Administration | |||||||||||||
| Source #2: Weather China | |||||||||||||
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