The high altitude sickness is normal physiological phenomenon. You do not need to worry about it. You are suggested to take some medicine for relieving high altitude sickness for fours days or one week before starting Lhasa tours. If you have cold, you are suggested to have Lhasa tour after recovering. If you catch a cold in your Lhasa tours, you should go to hospital to treat with medicine or take oxygen. If you do not get treatment in time, it may cause other serious disease, such as pneumonedema, edema, etc.
The public security of Lhasa is very good. Local Tibetans and monks in monasteries are very nice to travelers. But there are some people who dress up as monks to cheat travelers. Tibetan Tourism Bureau reminds travelers that the vehicles with the remark of "Tibet Tour" are not appointed vehicles by Tibet Tourism Bureau. On streets of Lhasa, there are some children and old women. You are suggested to take some small change and candy with you.
The temperature range of daytime and nighttime is very large, so you are suggested to take thick clothes with you to keep warm even in spring and autumn.
If you have Lhasa tours in summer, except for clothes for summer, you are suggested to take full-length trousers and long sleeved shirts, as well as wind coat and sweater to keep warm at night.
No matter having Lhasa tours in which season, you are suggested to prepare sunglasses and sun-proof equipments, such as hat, sun scream, lipstick, etc.
The best season to have Lhasa tours is from August to October. In this period, the climate is warm and humid. Lhasa has the reputation of "sunshine city". The sunshine duration of Lhasa is very long, and the climate is temperate. The summer of Lhasa is very cool, and winter is not very cold. The highest temperature in the year is in June when the average temperature is only 23 degree. The lowest temperature is in January when average temperature is 10 degree below zero. The precipitation of Lhasa is very small. But the dry season and humid season is very obvious. It mainly rains in July, August and September.
If you have Lhasa tours in summer, you can visit the Potala Palace, Jokhang Temple, Drepung Monastery and other monastery in daytime to enjoy mysterious religious atmosphere. In the night, you can enjoy yourself in Tibetan style bars to experience different Tibetan custom. If you come across Lhasa Shoton Festival (July 1st in Tibetan Calendar) in your Lhasa tours, you not only can enjoy performances of Tibetan Opera, but also can enjoy the grand scene of Buddha Exhibition in Drepung Monastery.
If you have Lhasa tours in winter, you not only can get preferential entrance tickets, but also can experience plateau hot spring and try to climb snow mountains. There, you not only can overlook snow mountains, but also can enjoy the beautiful scenes of whirling snow.