The topography and geographical location of Tibet and its great altitude create peculiar climate of Tibet. Generally speaking, the climate is rather harsh, with thin air, insufficient oxygen, intense sunlight and ultraviolet radiation. However, it is not impossible to visit this holy land. In summer it tends to be very cool, though in winter it is not as cold as people imagine due to the intense sunlight. Temperature extremes occur during both day and night due to the thin atmosphere being unable to either absorb or retain heat.
Tibet has a distinct rainy season and dry season, with the rainfall being very unbalanced. In spring and winter it tends to be dry and windy. During the rainy season, which runs from June to September, the rainfall reaches 90 percent of all annual precipitation. In southern and central Tibet, it always rains heavily at night, while in northern Tibet, thunder and hailstorms frequently occur. During this season, the heavy rainfall can often brings about serious traffic problems, with roads becoming blocked due to frequent landslides.
Northern Tibet has an altitude of over 4,500 meters (14,764 feet) and its winter lasts from October through to May or even June, and is both dry and bitterly cold with an average temperature below zero. The best time to visit this region is during July and August, when visitors can enjoy fresh air, warm temperature, vast green grassland, as well as the snow-capped peaks.
Valleys and vast forest, with a humid subtropical monsoon climate, primarily occupy the southeast of Tibet. This place is a favorable summer resort due to its pleasant climate and exquisite scenery. The best time to visit this area is between May and October, when visitors can best enjoy its virgin forest, monumental canyons, holy mountains and lakes, local festive events as well as the fragrant flowers and fruits found in this region.
Central Tibet is also a good summer resort, with the best tourism season between June and September. This region is a holy land with many great Buddhist monasteries. The geothermal springs here are well renowned for their remedial abilities to cure many skin diseases. This area is also a heaven for shutterbugs during this period because of its clear air and blue sky.
The southernmost area of Tibet, with its lowest temperature being minus 34 degrees C (minus 29 degrees F), is the site where the hotspot of mountaineering exploration in the Himalayas is located. It is a must for mountain climbing enthusiasts in spite of the harsh condition.
Lastly, remember that the intense ultraviolet radiation is a big challenge to traveling in Tibet. Visitors had better be well prepared with sunglasses, hat and sun-blocking cosmetics. In addition, it is a good choice to take some medicine for many visitors will feel sick due to high altitude and insufficient oxygen.