Bhutan's climate is maybe more differing than that of some other comparably estimated region on the world. The atmosphere of Bhutan changes with rise, creating striking meteorological differentiations, and varying exposures to daylight and dampness loaded breezes bring about complex nearby varieties. Three head climatic districts can be recognized: the hot, humid, subtropical tract of the Duars Plain and its contiguous lower regions; the cooler locale of the Lesser Himalayas; and the snowcapped tundra area of the Great Himalayas. A calm atmosphere happens just in the focal mountain valleys. For example, in Thimphu, in the nation's west-focal district, in January, high temperatures are generally in the low 50s F (around 12 °C) and low temperatures in the mid-30s F (around 2 °C); in July, Thimphu's temperatures are to some degree hotter, commonly ascending to the mid-60s F (around 19 °C) and dropping to the mid-50s F (around 13 °C). The rest of the nation encounters either outrageous warmth, as in the Duars, or extraordinary cold, as in the north.
Bhutan weather has four seasons and the atmosphere fluctuates relying upon the elevation.The Indian summer storm starts from late-June through July to late-September and is generally limited toward the southern fringe area of Bhutan. These rainfalls bring somewhere in the range of 60 and 90 percent of the western district's precipitation. Yearly precipitation runs broadly in different pieces of the nation. In the Northern fringe towards Tibet, the locale gets around forty millimeters of precipitation a year which is basically day off. In the mild focal locales, a yearly normal of around 1,000 millimeters is progressively normal, and 7,800 millimeters for each year has been enrolled at certain areas in the damp, subtropical south, guaranteeing the thick tropical timberland, or savanna.
Bhutan's commonly dry spring begins toward the beginning of March and goes on until mid-April and the southern locales experience commonplace sub-tropical climate like hot and moist conditions. But in Thimphu and Parovalley has high temperature days with cool night and clear blue sky. It is perceptibly hotter in Punakha and Wangdi valley. Summer climate starts in mid-April with incidental showers and proceeds to late June. Harvest time or autumn starts from late September or early October to late November, pursues the rainy season. It is described by brilliant, radiant days and some early snowfalls at higher rises.These months are considered as the best time for Trekking, these periods make conditions ideal for trekking with available high passes and stable temperature. it tosses open little windows of time in a year. With respect to other high height trek like Dagala, Jhomolari, Druk Path it is best time also.From late November until March, winter sets in, with ice all through a great part of the nation and snowfall regular above heights of 3,000 meters. The winter upper east storm brings intense breezes at the most astounding elevations through high mountain passes, giving Bhutan its name - Drukyul, which means Land of the Thunder Dragon in Dzongkha (the local language).