The
southern part of Bhutan is tropical,
and in general the east of Bhutan
is warmer than the west of the country.
The central valley of Punakha, Wangdiphodrang,
Mongar, Tashigang and Lhuntshi enjoy
a semi tropical climate with very
cool winters, while Thimphu, Tongsa
and Bumthang have a temperate climate,
with monsoon rains in the summer
and snow-fall in winter. Winter
in Bhutan is from mid-November until
mid-March, and at this time of year
the climate is dry, with daytime
temperature of 16-19 degree centigrade
(with sunshine and clear skies)
and nighttime temperature falling
below zero. The monsoon usually
arrives mid-June, with the rain
falling mainly in the afternoons
and evenings. At the end of September,
after the last of the big rains,
autumn suddenly arrives, and is
a magnificent season for trekking-lasting
until mid-November.
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