Tibet is in a high plateau, and it belongs to typical travel bali special climate. Climates are quite different in different areas of Tibet. The eastern Tibet which is at a lower elevation is warmer than western Tibet. In some mountain areas, there are four seasons at the same time in different altitude. The weather in a day varies greatly, too. The night is cold while the day is warm. It spans 12-15 degrees centigrade in a single day.
Climate in southeastern Tibet including Nyingchi and Chamdo is balmy with an average temperature of eight degrees centigrade; while in western Tibet (Shigatse and Nagqu) is quite cold with an average temperature below zero degree.
However in the central area of Tibet, the climate of Lhasa and Tsedang is more favorable for traveling. Travelers can visit these two areas all year around, not too hot in summer and not too cold in winter.
The rainy season in Tibet is mainly from June to August and it does have a very bad impact on the roads. However, there are many track maintenance workers and local army would also give help to restore the roads. Generally speaking, it only takes a few hours to make the roads feasible again. As for the rainproof, you are suggested to take raincoat, rain-proof trousers and shoes if you want to trek, climb the mountain or ride a bike. If you have group tours organized by some travel agencies, usually you don’t need to take rainproof with you, because Tibet often rains at night and the weather is quite good in the daytime. Besides, the tourist bus is always along with you.
Generally speaking, early April is the beginning of travel season, which lasts to mid-June when a large number of Chinese travelers rush to Tibet for summer holiday. Late June to the end of National Holiday is the peak travel season when some important festivals held in Tibet, like Shoton Festival, Gyantse Dawa Festival and Nagqu horse riding Festival. After mid October, Tibet turns to winter and as the visitors reduce greatly, more than half of hotels are closed for the poor reservation.
1. If you want an extremely cheap price, go to Tibet in winter, from December to next March. All the things are quite cheap; even the tourist sites offer 30-50% discount on entrance fee. Hotels are cheap, too. You can enjoy 5 star hotels with less than 100USD including breakfast. Compared with traveling in August, the cost of a winter tour is only 50%-60% of a summer tour. Because of the poor amount of visitors, the Potala Palace allows you to spend even a whole day in it. Besides, the monks are not busy and have spare time to chat with you.
2. If you like trekking, do it at May or September when the monsoon will never bother you and the weather is balmy and pleasant.
3. If you love Mt.Everest and want to see the clear face of it, try to avoid the rainfall season and foggy weather.
4. If you love to visit the grass land in north Tibet, do the tour in July when the flowers bloom in vast grassland and groups of yak and sheep, Tibetan nomad tents spread all over the grassland.
5. Those who want to drive to Tibet through Sichuan-Tibet highway should avoid the rainy season. There will be mudslides, cave-ins and mire on certain sections of the road, blocking the passage of vehicles.
High altitude sickness may occur at high altitudes (over 2700m) due to the decreasing availability of oxygen. It usually occurs following a rapid ascent and can usually be prevented by ascending slowly. Symptoms often manifest themselves six to ten hours after ascent and generally subside in one to two days, but they occasionally develop into the more serious conditions. Common symptoms of high altitude sickness include shortness of breath, headache, fatigue, stomach illness, dizziness, and sleep disturbance.