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Climate

Bhutan's climate is as varied as its altitudes and, like most of Asia, is affected by monsoons. The climate is humid and subtropical in the southern plains and foothills, temperate in the inner Himalayan valleys of the southern and central regions, and cold in the north, with year-round snow on the main Himalayan summits.
Temperatures in Thimphu, located at 2,320 meters in west-central Bhutan, range from approximately 15 to 26 °C (59 to 78.8 °F) during the monsoon season of June through September but drop to between about -4 and 16 °C (24.8 and 60.8 °F) in January. Most of the central portion of the country experiences a cool, temperate climate year-round. In the south, a hot, humid climate helps maintain a fairly even temperature range of between 15 and 30 °C (59 and 86 °F) year-round, although temperatures sometimes reach 40 °C (104 °F) during the summer. Thimphu experiences dry winter months (December through February) and almost no precipitation until March.
 

Bhutan's dry spring starts in early March and lasts until mid-April. Summer weather begins in mid-April with occasional showers and continues through the pre-monsoon rains of late June. The summer monsoon lasts from late June through late September with heavy rains from the southwest. The monsoon weather, blocked from its northward progress by the Himalayas, brings heavy rains, high humidity, flash floods and landslides, and numerous misty, overcast days. Autumn, from late September or early October to late November, follows the rainy season. It is characterized by bright, sunny days and some early snowfalls at higher elevations. From late November until March, winter sets in, with frost throughout much of the country and snowfall common above elevations of 3,000 meters.
Weather is extreme in the mountains: the high peaks have perpetual snow, and the lesser mountains and hewn gorges have high winds all year round, making them barren brown wind tunnels in summer, and frozen wastelands in winter.