With a hot and rainy summer and a dry winter.
January is the coolest month and April the warmest month.
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.
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.
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.
Heavy rainfall is characteristic of Bangladesh.
With the exception of the relatively dry western region of Rajshahi, where the annual rainfall is about 1600 mm, most parts of the country receive at least 2000 mm of rainfall per year.
Because of its location just south of the foothills of the Himalayas, where monsoon winds turn west and northwest, the regions in northeastern Bangladesh receives the greatest average precipitation, sometimes over 4000 mm per year.
About 80 percent of Bangladesh's rain falls during the monsoon season.
