Bangladesh has a tropical monsoon-type climate,
with a hot and rainy summer and a dry winter. January
is the coolest month with temperatures averaging
near 26 deg C (78 d F) and April the warmest with
temperatures from 33 to 36 deg C (91 to 96 deg F).
The climate is one of the wettest in the world.
Most places receive more than 1,525 mm of rain a
year, and areas near the hills receive 5,080 mm
). Most rains occur during the monsoon (June-September)
and little in winter (November-February).
Bangladesh is subject to devastating cyclones, originating
over the Bay of Bengal, in the periods of April
to May and September to November. Often accompanied
by surging waves, these storms can cause great damage
and loss of life. The cyclone of November 1970,
in which about 500,000 lives were lost in Bangladesh,
was one of the worst natural disasters of the country
in the 20th century.
Bangladesh has warm temperatures throughout the
year, with relatively little variation from month
to month. January tends to be the coolest month
and May the warmest. In Dhaka the average January
temperature is about 19°C (about 66°F), and the
average May temperature is about 29°C (about 84°F).
Required clothing: Lightweight cottons and linens
throughout the year. Warmer clothes are needed in
the evenings during the cool season. Waterproofs
are necessary during the monsoon season.