The Kingdom of Bhutan lies in the South Asia between China and India in the Himalayas. Climate and weather vary according to altitude and season of the year. The season of autumn, from September to late November, is considered to be the best time to visit the kingdom for trekking. The skies are generally clear and the high mountain peaks rise to a vivid blue sky. Autumn is the time of the popular Thimphu Tsechu festival. However, you can enjoy traveling in Bhutan any time of the year as each season offers you a fascinating journey.
The country is divided into three distinct tracts, starting from the southern foothills and the Himalayan crest, running from south to north. The three climatic zones according to the altitude are:
Tropical: The southern border areas on the foothills
Sub-tropical: From the jungles in the southern Bhutan to lower mountains with altitudes of 2000 – 2500 metres.
Alpine: Towards northern high land of the Himalayas
The summer months of April to July are particularly hot in the south. But, the central and western Bhutan remain relatively cool and pleasant. The winter months from December to February are the most suitable time for bird watching and rafting. In the March-April months of spring the trekking routes are open at the moderate altitudes.
Average Rainfall According to the Region:
Himalayan region: Less than 500mm
Inner central valley’s: 500mm to 1000mm
Southern foothills: 2000mm to 3500mm
Southern border area: 3000mm to 5000mm