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, mm of rain a year, and areas near the hills receive 5, mm.
Most rains occur during the monsoon June-September and little in winter November-February. Because of the country's location in the tropical monsoon region, the amount of rainfall is very high. However, there is a distinct seasonal pattern in the annual cycle of rainfall, which is much more pronounced than the annual cycle of temperature.
Rainfall during this season varies from less than 2 cm in the west and south to slightly over 4 cm in the northeast. The amount is slightly enhanced in the northeastern part due to the additional uplifting of moist air provided by the Meghalaya Plateau. As the winter season progresses into the pre-monsoon hot season, rainfall increases due to intense surface heat and the influx of moisture from the Bay of Bengal.
The amount of rainfall in this season varies from about 20 cm in the west central part to slightly over 80 cm in the northeast. The additional uplifting by the Meghalaya Plateau of the moist air causes higher amount of rainfall in the northeast. Rainfall during the rainy season is caused by the tropical depressions that enter the country from the Bay of Bengal. The amount of rainfall in this season varies from cm in the west central part to over cm in the south and northeast.
Average rainy days during the season vary from 60 in the west-central part to 95 days in the southeastern and over days in the northeastern part. Geographic distribution of annual rainfall shows a variation from cm in the west-central part of the country to more than cm in the northeastern and southeastern parts.
The maximum amount of rainfall has been recorded in the northern part of Sylhet district and in the southeastern part of the country Cox's Bazar and Bandarban districts. Climatic stations Bangladesh Meteorological Department is responsible for observation, recording and archiving of climatic data for various stations in the country. Climatic stations are scattered around the country - to record the diverse geographic conditions of the country.
Weather report Bangladesh Meteorological Department prepares the weather reports of the country. Every day, all weather stations around the country transmit their recorded data electronically to the Headquarters of the meteorological department in Dhaka. The details of data are analysed, interpreted and mapped here. The result of the analysis, combined with the observation of upper air, satellite imagery and radar imagery collected in Dhaka are used for weather forecasting.
Observation and interpretation of satellite and radar imageries are important for prediction of severe weather and cyclones. Weather bulletins and forecasting by the Bangladesh Meteorological Department for 6-hour, hour and hour periods are broadcast on radio and television.
During an impending cyclone, observation and forecasting are made and warnings issued almost continuously through radio and television. In addition to radio and television, daily newspapers publish weather reports regularly on the basis of information supplied by the meteorological department. 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. Natural calamities, such as floods, tropical cyclones, tornadoes, and tidal bores--destructive waves or floods caused by flood tides rushing up estuaries--ravage the country, particularly the coastal belt, almost every year.
Between and , thirteen severe cyclones hit Bangladesh, causing enormous loss of life and property. In May , for example, a severe cyclonic storm packing kilometer-per-hour winds and waves 4 meters high swept into southeastern and southern Bangladesh, killing more than 11, persons, damaging more than 94, houses, killing some , head of livestock, and damaging nearly kilometers of critically needed embankments.
Annual monsoon flooding results in the loss of human life, damage to property and communication systems, and a shortage of drinking water, which leads to the spread of disease. For example, in two-thirds of Bangladesh's sixty-four districts experienced extensive flood damage in the wake of unusually heavy rains that flooded the river systems. The monsoon has left the country during the month of October, but the rains can sometimes last until November, especially in the south-east, or when a cyclone arrives.
The actual winter begins in December and is characterized by warm and sunny days, followed by cool nights. Here are the average temperatures of Saidpur.
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