In terms of climate, traveling to Tibet from March to October is proper, while from May to June and September to October is the best time to travel to Tibet.

In the spring(March to May), Lhasa is dry and windy. Unlike most cities, the weather is sunny and the ultraviolet rays are strong. In the early spring, the weather was still cold, with little rain and warming in May. March is the best time to visit the Nyingchi area because the peach trees are in full bloom, although the weather is still cold. In late April and early May, Namtso Lake began to melt. When the sun shines on the lake, the frozen lake is melting and you will appreciate the rare and magnificent views of Namtso Lake.

Autumn(September to October), is the peak season for tourists to have a Tibet tour, when the weather is pleasant with clear and blue sky, and yellow leaves. The Tibet in autumn present a state of vicissitude and magnificence.
September is a great time for pilgrims to have a kora around Mount Kailash, so you can enjoy the stunning view of Mt. Kailash and Lake Manasarovar.