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Bhutan is a comparatively small state that is almost enclosed by the large states of India and China. The country has relatively strong ties to India.
Basically, Bhutan is influenced by the southwest monsoon, which mainly acts between June and September and then brings the most rainfall.
The central lowlands have similar climatic conditions as the region around the Indian Darjeeling. That means: the temperatures are quite pleasant and hardly rise above 18 degrees in the annual average, it gets warmest from July to September with peak temperatures of approx. 30 degrees. However, the main rainy season is also between May and September. Very little precipitation, but colder, is from November to March.
A special feature of the country is the dual zone, which has an almost subtropical climate. But Bhutan is also a very mountainous country that extends from the foot of the Himalayas near India to its highest peaks. It is therefore also clear that Bhutan also has a high mountain climate. The climate in the mountainous part can be compared with the mountain climate in Nepal. The higher you go, the colder it gets. The snow line in the country is around 5,000 meters. Precipitation in the mountains depends primarily on the orientation of the regions. Areas to the north are in the rain shadow and are relatively dry, areas to the south, on the other hand, have very high precipitation.
The best time to travel to Bhutan is most likely between November and March. Many visitors describe October and November as the best months. Basically you should avoid June to September, because this is where the monsoons are most powerful.