About 80% of Bangladesh's rain falls during the monsoon season. The monsoons result from the contrasts between low and high air pressure areas that result from differential heating of land and water. During the hot months of April and May, hot air rises over the Indian subcontinent, creating low-pressure areas into which rush cooler, moisture-bearing winds from the Indian Ocean. This is the southwest monsoon, commencing in June and usually lasting through September. Dividing against the Indian landmass, the monsoon flows in two branches, one of which strikes western India. The other travels up the Bay of Bengal and over eastern India and Bangladesh, crossing the plain to the north and northeast before being turned to the west and northwest by the foothills of the Himalayas.
about 80% of bangladesh's rain falls during the monsoon season the monsoons result from the contrasts between low and high air pressure areas that result from differential heating of land and water during the hot months of april and may hot air rises over the indian subcontinent creating low-pressure areas into which rush cooler moisture-bearing winds from the indian ocean this is the southwest monsoon commencing in june and usually lasting through september dividing against the indian landmass the monsoon flows in two branches one of which strikes western india the other travels up the bay of bengal and over eastern india and bangladesh crossing the plain to the north and northeast before being turned to the west and northwest by the foothills of the himalayas