Bhutan faces the varieties of climate. The climate in Bhutan varies with elevation, from subtropical in the south to temperate in the highlands and polar-type climate, with year-round snow in the north. Temperatures can vary between 15-30 degrees Celsius in the southern part of Bhutan. Bhutan experiences four distinct seasons: autumn, spring, summer and winter. Western Bhutan has the heavier monsoon rains; southern Bhutan has hot humid summers and cool winters; central and eastern Bhutan is temperate and drier than the west with warm summers and cool winter.
Visitors should take note of the following TWO main seasons, Spring and Autumn, both of which offer the chance to visit festivals and to adventure. The first season Spring last from March to May. This is the season in Bhutan where a tiny caterpillar transforms into an overwhelming butter fly, which means that this is the season for magnificent flowers and birds, the days are temperate and the mountain peaks are still clearly viewed from a distance. Temperatures at these months are mostly favourable in Bhutan with fair degree Celsius.
The other excellent time is Autumn where the month falls between September to November. At this time the rains are very less, the skies are of crystal clear backed by bright sunny days and some early snowfalls at higher altitudes and this is the season where most of the festivals (Tshechus) take place.
Summer (June to August) is the monsoon season which means there will be heavy rain and high humidity, especially to the southern region. There might be frequent landslides, floods, windstorms, lightening and thundering and as a result there could be unstable transportation and communication facilities. Nevertheless, we don’t actively discourage travel during this season, because it is still a good time to visit Paro, Thimphu, Punakha, Phobjikha/ Gangtey Valley, etc., and some parts of Central Bhutan.
Winter Season (December, January and February) are extremely cold but still it is recommended that visitors can come to Bhutan to visit Central, Southern and some parts of Western Bhutan. The northern and some parts of western Bhutan are mostly covered with frost and snowfall common above the altitudes of 3,000 meters. Some of the upper trek routes may remain closed due to heavy snow fall yet the beauty of country is incredible at this time. The skies are still of crystal clear and you’ll have the breath-taking views of the country at this time too.