Bhutan is a year round tourist destination which enjoys varied climatic conditions. This variation in climatic conditions and average temperature can be attributed to two main factors, vast differences in altitude present in the country and influence of north Indian monsoons.
Southern Bhutan has a hot, humid sub-tropical climate that is fairly unchanging throughout the year. Temperatures can vary between 15-30 degrees Celsius. In central Bhutan the climate cools a bit, changing temperate and deciduous forests with warm summers and cool winters. In Northern part of the kingdom weather is cold during winter, mountain peaks are perpetually covered in snow and lower parts are still cool in summer owing to the high altitude terrain.
Annual precipitation ranges widely in various parts of the country. In the northern border region close to Tibet gets about 40 mm of precipitation a year which is primarily snow. In Central Bhutan region, yearly average of around 1,000 mm is more common with 7,800 mm per year being registered at some locations in the humid, sub-tropical southern Bhutan ensuring thick tropical forest. Thimphu experiences dry winter months (December through February) and almost no precipitation until March, when rainfall averages 20 mm a month and increases steadily thereafter to a high of 220 mm in July & August for a total annual rainfall of nearly 650 mm.
Bhutan’s dry spring starts early March and lasts until mid April. Summer weather commences mid April with occasional showers and continues until late June. The heavier summer rain starts late June until late August which is more monsoonal along the southwest border.Bhutan’s dry spring starts early March and lasts until mid April. Summer weather commences mid April with occasional showers and continues until late June. The heavier summer rain starts late June until late August which is more monsoonal along the southwest border.
Autumn, from early September until mid November, follows the rainy season and is characterized by bright, sunny days with some early snowfalls at higher elevations.
From mid November until late February, winter sets in, with frost throughout much of the country and snowfall common above elevations of 3,000 meters. The northeast winter rain brings gale-force winds at the highest altitudes through high mountain passes, giving Bhutan its name – Druk yul in Dzongkha language, which means Land of the Thunder Dragon