Beijing Climate & Terrain

Beijing has a rather dry, monsoon-influenced humid continental climate (Koppen climate classification Dwa), characterised by hot, humid summers due to the East Asian monsoon, and generally cold, windy, dry winters that reflect the influence of the vast Siberian anticyclone.[41] Spring can bear witness to sandstorms blowing in from the Mongolian steppe, accompanied by rapidly warming, but generally dry, conditions. Autumn, like spring, sees little rain, but is crisp and short. The monthly daily average temperature in January is -3.7 °C (25.3 °F), while in July it is 26.2 °C (79.2 °F). Precipitation averages around 570 mm (22.4 in) annually, with the great majority of it falling in the summer months. Extremes have ranged from -27.4 to 42.6 °C (-17 to 109 °F).

Climate data for Beijing (1971-2000)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °C (°F) 1.8
(35.2)
5.0
(41.0)
11.6
(52.9)
20.3
(68.5)
26.0
(78.8)
30.2
(86.4)
30.9
(87.6)
29.7
(85.5)
25.8
(78.4)
19.1
(66.4)
10.1
(50.2)
3.7
(38.7)
17.9
(64.2)
Average low °C (°F) -8.4
(16.9)
-5.6
(21.9)
0.4
(32.7)
7.9
(46.2)
13.6
(56.5)
18.8
(65.8)
22.0
(71.6)
20.8
(69.4)
14.8
(58.6)
7.9
(46.2)
0.0
(32.0)
-5.8
(21.6)
7.2
(45.0)
Precipitation mm (inches) 2.7
(0.106)
4.9
(0.193)
8.3
(0.327)
21.2
(0.835)
34.2
(1.346)
78.1
(3.075)
185.2
(7.291)
159.7
(6.287)
45.5
(1.791)
21.8
(0.858)
7.4
(0.291)
2.8
(0.11)
571.8
(22.512)
%humidity 44 44 46 46 53 61 75 77 68 61 57 49 56.8
Avg. precipitation days (>= 0.1 mm) 1.8 2.3 3.3 4.3 5.8 9.7 13.6 12.0 7.6 5.0 3.5 1.7 70.6
Mean monthly sunshine hours 194.1 194.7 231.8 251.9 283.4 261.4 212.4 220.9 232.1 222.1 185.3 180.7 2,670.8
Source: China Meteorological Administration

Lhasa Climate & Terrain

Due to its very high elevation, Lhasa has a cool semi-arid climate with frosty winters and mild summers, yet the valley location protects the city from intense cold or heat and strong winds. The city enjoys nearly 3,000 hours of sunlight annually and is thus sometimes called the "sunlit city" by Tibetans. The coldest month is January with an average temperature of −1.6 °C (29.1 °F) and the warmest month is June with a daily average of 16.0 °C (60.8 °F), though nights have generally been warmer in July. The annual mean temperature is 7.98 °C (46.4 °F), with extreme temperatures ranging from −16.5 to 30.4 °C (2 to 87 °F). Lhasa has an annual precipitation of 426 millimetres (16.8 in) with rain falling mainly in July, August and September. The driest month is January at 0.8 millimetres (0.03 in) and the wettest month is August, at 120.6 millimetres (4.75 in). The rainy season is widely regarded the "best" of the year as rains come mostly at night and Lhasa is still sunny during the daytime.

Climate data for Lhasa (1971−2000)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °C (°F) 7.2
(45.0)
9.3
(48.7)
12.7
(54.9)
15.9
(60.6)
19.9
(67.8)
23.2
(73.8)
22.6
(72.7)
21.4
(70.5)
19.9
(67.8)
17.0
(62.6)
12.1
(53.8)
8.0
(46.4)
15.8
(60.4)
Average low °C (°F) −9
(15.8)
−5.8
(21.6)
−2.1
(28.2)
1.5
(34.7)
5.6
(42.1)
9.8
(49.6)
10.4
(50.7)
9.7
(49.5)
7.7
(45.9)
2.0
(35.6)
−4.2
(24.4)
−8.2
(17.2)
1.5
(34.7)
Precipitation mm (inches) .8
(0.031)
1.2
(0.047)
2.9
(0.114)
6.1
(0.24)
27.7
(1.091)
71.2
(2.803)
116.6
(4.591)
120.6
(4.748)
68.3
(2.689)
8.8
(0.346)
1.3
(0.051)
1.0
(0.039)
426.5
(16.791)
% humidity 28 26 27 37 44 51 62 66 63 49 38 34 43.8
Avg. precipitation days (≥ 0.1 mm) .7 1.0 1.6 4.3 9.9 14.3 19.1 20.0 15.4 4.5 .7 .6 92.1
Mean monthly sunshine hours 250.9 226.7 246.1 248.9 276.6 257.3 227.4 219.6 229.0 281.7 267.4 258.6 2,990.2
Source: China Meteorological Administration