When will it snow and close the mountain in Tibet?

10 year 10 month to May of the following year.

Popular attractions that are easily closed by heavy snow include Everest Base Camp and Namco. Although these two places are prone to snow, they are both near the main roads. After the snow, there will be snow shovels and other overtime to grab the sidewalk, so it will basically not cause long-term closure.

However, due to the snowy night at high altitude (especially the "Nagenla Pass" leading to Namco), it is impossible to predict in advance if there is sudden heavy snow. In order to ensure travel, real-time attention to the weather forecast is king. In short, the probability of being trapped in Lhasa due to heavy snow closure in the whole winter adds up to about 10 days.

Due to the influence of topography, landforms and atmospheric circulation, the climate in Tibet is unique, complex and diverse. Generally speaking, the climate in the northwest is cold and dry, and the climate in the southeast is warm and humid. So from southeast to northwest, the climate types are tropical, subtropical, temperate plateau, sub-frigid plateau, frigid plateau and so on. In the alpine valleys and southern slopes of the Himalayas in southeastern Tibet, due to the repeated uplift of the terrain, the temperature gradually drops, and the climate changes vertically from tropical or subtropical climate to temperate, cold temperate and frigid climate.

With the increase of altitude and the decrease of air pressure and air density, the oxygen content per cubic meter of air gradually decreases, which is equivalent to 73% of sea level at an altitude of 3,000 meters, 62% ~ 65.4% at 4,000 meters, 59% at 5,000 meters and less than 52% above 6,000 meters.

Under the alternating control of winter westerly wind and summer southwest monsoon, the difference between dry season and rainy season in Tibet is very obvious. The general dry season is 10 to April of the following year. May to September is the rainy season, and the rainfall generally accounts for about 90% of the annual precipitation. The precipitation in different places is also seriously uneven, and the annual precipitation is gradually reduced from 5000 mm in the southeast lowlands to 50 mm in the northwest.

The climate in southern Tibet and northern Tibet is very different. Affected by the warm and humid air current in the Indian Ocean, the southern Tibet Valley is mild and rainy, with an annual average temperature of 8℃, a monthly average minimum temperature of-16℃ and a monthly average maximum temperature of over 16℃. The northern Tibetan Plateau has a typical continental climate, with an annual average temperature below 0℃ and a freezing period of half a year. The highest temperature in July does not exceed 10℃, and it is warmer in June-August, rainy in winter and windy at night. As far as the climate is concerned, March to 65438+1October is more suitable for traveling to Tibet, and June to September is the best season.

Tibet is the place with the largest solar radiation energy in China, which is twice as much as the plain area at the same latitude, namely 1/3. The sunshine time is also the longest in the country. Compared with the mainland of China, the temperature in most parts of Tibet is low, and the annual average temperature in Lhasa and Shigatse is lower than that in Chongqing, Wuhan and Shanghai at the same latitude 10 ~ 15℃. In Ali, where the altitude is more than 5000 meters, the daytime temperature is only about 10℃ in midsummer and August, and the temperature will even drop below 0℃ at night.