The climate is mainly determined by the southwest monsoon. During this period, from June to August/September, most of the average 2,000 mm annual precipitation falls.
In accordance with the division of Bhutan into three landscape zones, the climatic conditions vary greatly from region to region. The climate of the Duarzone is subtropical, in central Bhutan the climate is temperate, while further north with increasing altitude the winters become increasingly severe and the summers cooler. The snow line is around 5,000 metres.
In addition, there are small-scale topographical differences, which are particularly noticeable in the High Himalayas. While rainfall in the northern rain shadow is sometimes less than 250 mm, precipitation on the southern slopes can reach up to 5,000 mm.
The average temperatures in Bhutan are about 17° C in January and 28° C in July.
Bhutan can be visited all year round. The monsoon season from June to August is the worst. The best visibility is in autumn, from the end of September to the beginning of December.