Let me tell you a bit about what I am seeing and doing. Tibet reminds me of the drier sections of the Rocky Mountains, perhaps Wyoming or western Colorado. Lhasa is about 12,000 ft and the mountains above have only low growth, green grasses and shrubs less than a foot high. The earth is tan clay colored in some places, reddish brown in others.
Trees grow along the river banks and in the cities where they have been planted.
The climate is dry, the sun in intense, the breezes are quite pleasant. On clear days the daytime highs have been close to 80, I estimate, and the nights around 50. When it has been cloudy the days have been in the 60s. Just like Colorado, we layer our clothes because conditions change rapidly. Many of the people are tall and statuesque, quite elegant even as they harvest grain or herd animals.