The climate in Bhutan is extremely varied. This variation in the climatic conditions and average temperature can be attributed to two main factors-the vast differences in altitude present in the country and the influence of North Indian monsoons.
Southern Bhutan has a hot and humid subtropical climate that is fairly unchanging throughout the year. Temperatures can vary between 15-30 degrees Celsius (59- 86 degrees Fahrenheit). In the Central parts of the country which consists of temperate and deciduous forests, the climate is more seasonal with warm summers and cool and dry winters. In the far Northern reaches of the kingdom, the weather is much colder during winter. Mountain peaks are perpetually covered in snow and lower parts are still cool in summer owing to the high altitude terrain.
The Indian summer monsoon begin from late-June through to late-September and is mostly confined to the southern border region of Bhutan and it brings heavy rain and high humidity. These rains bring between 60 and 90 percent of the western region's rainfall.