It is hard to generalize Bhutan’s weather since the mountain climate varies enormously from one region to another. It varies with the altitude and can also reach extremes of heat and cold within same 24 hours at any given altitude.

Southern Bhutan is tropical, with monsoon season. The east is warmer than the west. The central valleys of Punakha, Wangdi Phodrang, Mongar, Tashigang and Lhuntshi enjoy a semi-tropical climate with very cold winters, whereas Ha, Paro, Thimpu, Tongs and B have a much harsher climate, including occasional snowfalls in winter. The north of the country is inhabited up to 5,000 meters (16,400 feet) in summer.

The climate here is rouch, with monsoon rains in summers and heavy snowfalls in winter that block the passes leading into the central valleys. In these valleys, where most tourist activities are concentrated, the winters (mid-November to mid-March) are dry, with day time temperatures of 16-18oC(60-65 oF) if the sun is shining. By contrast, the evenings and early mornings are cold, with night - time temperatures falling below freezing. Spring lasts from mid-March to the beginning of June, with temperatures warming gradually to 27-29 o C (80-84 o F) by the day and 18 o C (64 o F) at night. Monsoon begins in mid-June and the daytime temperatures are 23-24 oC (73-75 oF) and 15-16 oC (59-61 oF) at night. Autumn begins from end of September and is a magnificent season that lasts until mid-November.