Title:Weather in Tibet You Should Know


General characteristics: intense radiation, and more sunshine, the temperature is low, less accumulated temperature, air temperature with altitude and latitude increases. It is estimated that for every increase in altitude of 100 meters, average annual temperature decreased 0.57 ℃, is increased by 1 degree latitude, the average annual temperature decreased 0.63 ℃, large diurnal; distinct wet and dry, multi-night rain; long dry and cold winter, high winds and more ; cool and rainy summer, hail and more; seasons is unknown. Most parts of the warmest monthly average temperature below 15 ℃ in January and July average temperature lower than the same latitude in the eastern plains 15-20 ℃. By climate classification, in addition to the southeast edge of the valley, the whole of Tibet throughout the year without a summer. Total radiation values ??as high as 5850-7950 MJ / m, compared with 0.5-1 times higher latitudes in the eastern plains.

The main climatic characteristics of the winter months:

The main features of the winter half year is cold and dry, precipitation, more wind. High-altitude Tibetan plateau, the temperature is low. January average temperature, in addition to southeast Tibet and the Himalayas south wing, the other regions were lower than 0 ℃, the majority of the extreme minimum temperature below -20 ℃, altitude 4507 meters of Nagqu also appeared -41.2 ℃ low temperature.

As the height disparity, making the low-temperature duration varies greatly. Western and northern regions from October to April the following year's monthly average temperatures mostly below 0 ℃, 4,000 meters above sea level below the monthly average temperature of the Brahmaputra valley below 0 ℃, there are 2-3 months. Extreme minimum temperature ≤ 0 ℃ number of days in the western and northern regions up to 250-280 days, the Brahmaputra region of about 100-200 days, the Southeast is in 100 days or less.

Winter half year precipitation, air dry. In addition to the Himalayas and south-east outside the 11-April precipitation is less than 80 mm, less than 12% of annual precipitation, and some less than 5%. Relative humidity is very low, most regions are between 30-40%, one of the national minimum. More snow in the Himalayas and south-east, rainfall of up to 150-300 mm, accounting for more than 20% of annual precipitation.

Westerly flow of high altitudes, the winter winds more than six months. In addition to the east traverse mountains, most of the regional level throughout the year winds ≥ 8 days in 50 days, the western and northern regions up to 100-165 days, the wind on more concentrated in the winter months. Air density on the plateau, under the same conditions in the wind, air pressure low, generally only 60-80% of the plains.

The main climatic characteristics of the summer months:

The main summer months the climate is characterized by abundant sunshine, the temperature cool and pleasant, concentrated rainfall, more night rain and hail.

Tibet's thin air dry-cleaning, good transparency, solar radiation and sunshine duration is much greater than the same latitude. Such as Lhasa, the average annual sunshine time is 3007.7 hours. Average total optical radiation 7784.2 joules / square meter, and therefore, "Solar City" reputation.

As the high-altitude Tibetan plateau, the summer months and the rainy season, the warmest month average temperature of 18 ℃, mostly in the following, so the temperature is not high, cool and pleasant. The average elevation of 4,500 meters below the southeast corner and the Brahmaputra valley to 10-18 ℃, the average elevation of 4,500 meters above the plateau region Qiangtang below 10 ℃, and below 1000 meters above sea level south wing of the outer edge of the lower Himalayan Mountains, the annual average temperature ≥ 10 ℃.

Precipitation is highly concentrated in the summer months, usually accounts for 80-90% of the year. Southeast lowland rainfall generally increases from March, in eastern Tibet and northern Tibet in mid-May and late rainy season, the Brahmaputra River from June to mid rainy season, Shigatse in the western region in late June to early July began to enter the the rainy season, low precipitation Ali, no rainy season.

Precipitation decreasing from southeast to northwest, the Himalayas on the windward side, precipitation up to 1000 mm, and its northern foot of a narrow strip between the Brahmaputra, but less than 300 mm of annual precipitation for the "rain shadow zone . "

"Plateau Night Rain" and many hail the summer months the climate in Tibet is another feature. Such as in the broad valley of Lhasa and Shigatse, the terrain, night rain rate of 80% for the central plateau of the night rain. Tibet is the country the largest number of hail days in areas such as Nagqu 35.9 days on average hail, small hail and more.