Most of Tibet is a high-altitude desert plateau at more than 4000m. Days in summer (June to September) are warm, sunny and generally dry, but temperatures drop quickly after dark. It’s always cool above 4000m and often freezing at night, though thanks to the Himalayan rain shadow there is surprisingly little snow in the Land of Snows. Sunlight is very strong at these altitudes, so bring plenty of high-factor sunscreen and lip balm.