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Weather Along the Friendship Highway (Lhasa - Shigatse - Lhatse - Tingri – Nylam), conditions are generally good all year around. However, from December to February, thawing snow and ice on the road can make travelling difficult. In August landslides can occur owing to the heavy rainfall.
Mt.Everest Area: Early May and early October are the best months to visit Mt. Everest. From December to February, weather conditions become much colder and therefore more hazardous.
Ali (Mt.Kailash): Even considering climatic variations, this area is already considered inhospitable. Heavy rain and snow can make journeys difficult. However, for those determined, the appropriate months are May, June, July, September and October.
Eastern Tibet: It isn’t recommended to travel to this area in July or August (the rainy season) because the rain can flood roads and cause landslides. In winter months, roads can be frozen.
Northern Tibet: With an average altitude of 4,500m, this area offers a limited opportunity for tourists. Summer months (July to August) are the prime time to enjoy the great plains of northern Tibet.
Tibet has similar seasons to China, though with lower temperatures due to the higher altitudes. Winters (November to March) are cold (the average temperature in January is -2°C) but there isn’t all that much snow. Summers (May to September) have warm days with strong sunshine and cool nights. At higher elevations (ie above 4000m) even summer days can be chilly. During spring and autumn you need to be prepared for four seasons in one day, including the possibility of snowfall. There are some regional variations; northern and western Tibet are generally higher and colder. The monsoon affects parts of Tibet (particularly eastern Tibet) from mid-July to the end of September (July and August bring half of Tibet’s annual rainfall).
Climate is not such a major consideration when visiting Tibet as many people might imagine. For a place nicknamed ‘The Land of Snows’, there’s a surprising lack of snow. The boom in domestic tourism means that Lhasa swells with tourists in the summer and particularly in the week-long holidays around 1 May and 1 October. Finding accommodation can be trickier during these weeks, so try to have something nailed down by lunch time. Winter is very cold, many restaurants are shut and snow can close mountain passes, but some travellers swear by the winter months. There are few travellers about at this time and Lhasa is crowded with drokpas (nomads). The average temperature in January is -2°C.
Spring, early summer and late autumn are probably the best times to visit Tibet. March is a politically sensitive month in the country and there is occasional tightening of restrictions on travellers heading into Tibet at this time, but the weather’s pretty good. April brings reliable weather in eastern Tibet and discounts on accommodation and vehicle rental in Lhasa. Mt Everest is particularly clear during April and May.
From mid-July through to the end of September the monsoon starts to affect parts of Tibet. (The months of July and August bring half of Tibet’s annual rainfall.) Travel to western Tibet becomes slightly more difficult, the roads to the east are temporarily washed out and the Friendship Highway sometimes becomes impassable on the Nepal side or on the border itself.
Trips to Mt Kailash can be undertaken from April to October, although September and October are considered the best months. October is also the best time to make a trip out to the east. Lhasa and its environs don’t get really cold until the end of November.