Bhutan has four distinct seasons. Each has its advantage and disadvantages for the visitor. Notice should be taken of the predictable weather patterns before making decisions when to visit. Remember even predictable weather can vary dramatically plains close to the Indian border are warmer and more tropical than higher central valley.
Spring is arguably the most beautiful time of the year in the Kingdom. The fierce cold that characterized the winter months tend to subside towards the end of the February (around Bhutanese New Year, Lhosar). Rhododendron begins to bloom, first in the warmer east. At the height of spring, the end of the march, the whole kingdom comes to life with the spectacular flaming red, pink, and white of the rhododendron blossom.
The annual monsoon from the Bay of Bengal affects the south and central regions. The north is in habited in the summer months when nomads return to the higher plains to tend to their yak herds