Weather and Climate in Bhutan
Weather and Climate in Bhutan are varied depending on the distance from the ground. In the southern border areas it is tropical; at the other excessive, in the high Himalayan regions, there is uninterrupted snow. In winter, the sky is bright and it is sunny but cold, particularly when the sun hides behind the mountains in the mornings and evenings. At night, the temperature falls below zero. Spring and autumn are very pleasant with warm days and cool nights. Spring is perhaps the most attractive time of the year. Rhododendrons begin to bloom, first in the warmer east. At the height of spring, the end of March, the entire country comes to life with the amazing flaming red, pink and white of the Rhododendrons and white and yellowish Magnolia. Over all, 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.
The high mountain peaks are snow covered through the year and the mountain passes, especially Thrumsing La (between Bumthang and Mongar), can be treacherous during winter. Thimpu and Paro have light snowfall in winter, and once in a while come a heavy snowstorm. Temperatures in the far south range from 15°C in winter (December to February) to 30°C in summer (June to August). In Paro, the range is from -5°C in January to 30°C in July, with 800mm of rain. In the high mountain regions the average temperature is 0°C in winter and may reach 10°C in summer, with an average of 350mm of rain.