Climate Report; Report on Roanu; Report on MORA; Newsletter. The average annual rainfall varies from a maximum of 5,690 mm in the northeast of the country to minimum of 1,110 mm in the west. The additional uplifting (by the Meghalaya Plateau) of the moist air causes higher amount of rainfall in the northeast. The amount of rainfall in this season varies from 100 cm in the west central part to over 200 cm in the south and northeast. Rainfall. The least humid months in the eastern areas are January to March. Heavy rainfall is characteristic of Bangladesh causing it to flood every year. On the other hand, during the summer season, a centre of low pressure develops over the west-central part of India because of intense surface heat. Climatic change Any climatic change in Bangladesh will, of course, be a part of worldwide climatic changes. The overall objective of this paper is to assess the present trend of high intensity rainfall and compare it with the predicted future trend and gather information on the effect of climate change on rainfall pattern and intensity. 0000001693 00000 n The rainy season, which coincides with the summer monsoon, is characterised by southerly or southwesterly winds, very high humidity, heavy rainfall, and long consecutive days of rainfall which are separated by short spells of dry days. The climate is tropical in Dhaka. 0000004360 00000 n However, there is another side to the argument. 0000002173 00000 n However, it is more extensive in the southern and eastern parts (90%) than in the northwestern part (75%). Observation and interpretation of satellite and radar imageries are important for prediction of severe weather and cyclones. Bangladesh : Rainfall & Weather. 0000010017 00000 n Annual Weather Averages Near Rajshahi. The most striking feature of its climate is the reversal of the wind circulation between summer and winter, which is an integral part of the circulation system of the South Asian subcontinent. In late December and early January, minimum temperature in the extreme northwestern and northeastern parts of the country reaches within 4 to 7 degrees of freezing point. However, the cold winter air that moves into the country from the northwestern part of India loses much of its intensity by the time it reaches the northwestern corner of the country. January, the same as December, is a moderately hot winter month in Dhaka, Bangladesh, with average temperature fluctuating between 12.7°C (54.9°F) and 25.4°C (77.7°F).January is the coldest month, with an average high-temperature of 25.4°C (77.7°F) and an average low-temperature of 12.7°C (54.9°F). The amount is slightly enhanced in the northeastern part due to the additional uplifting of moist air provided by the Meghalaya Plateau. 0000063253 00000 n During the early part of the pre-monsoon season, a narrow zone of air mass discontinuity lies across the country that extends from the southwestern part to the northeastern part. It is generally claimed that the temperature of the earth has been increasing since the beginning of the 20th century. 0000005087 00000 n 238 0 obj<> endobj 0000025793 00000 n During this season, wind inside the country generally have a northerly component (flowing from north or northwest). Rainfall The single most dominant element of the climate of Bangladesh is the rainfall. The department is responsible for observation, recording, operation and maintenance of weather stations and weather instruments, and for reporting of daily/weekly weather information to the public. xref 0000063522 00000 n ËD$NÈWi. The average annual discharge from the three major rivers - a … Precipitation in Bangladesh increased to 5.94 mm in December from 5.07 mm in November of 2015. Climate Report; Report on Roanu; Report on MORA; Newsletter. Temperature of the earth has increased by 0.3-1°C since the beginning of the 20th century as a consequence of increased CO2 in the atmosphere. curves, which give a plot of rainfall intensity versus rainfall duration and recurrence interval. The driest month of the season is December when the northern and the western districts get hardly 3 -10 mm of rainfall . 0000003789 00000 n IDF curves and relationships presented in this paper will be useful for estimation of storm runoff of urban areas of major cities of Bangladesh. Murshed, A.K.M. Clouds In Bangladesh, the cloud cover has two opposing seasonal patterns, coinciding with the winter monsoon and the summer monsoon. 0000001609 00000 n The average annual discharge from … The lowest average relative humidity (57%) has been recorded in Dinajpur in the month of March. xÚb```f``9ÂÀÁÀ dÌ È€ ‚l@ÈÂÀ¡ÂÌÁÆ´Œ‰¡ôȉ:eâë~êXÄÀP¸]2+m&6Àqáœ`ª¿ÈƓ In that case, all low coastal plains and delta areas around the world will be submerged - thereby reducing the area of fertile agricultural lands and food production, and increasing food shortage, hunger, poverty and human misery on a global scale. During the winter season, a centre of high pressure lies over the northwestern part of India. In some places in Rajshahi and Kushtia districts the maximum temperature in summer season rises up to 40°C or more. Now a day, erratic rainfall becomes very common in Bangladesh. Except for the relatively dry western region of Rajshahi, where the annual rainfall is about 1,600 mm (63.0 in), most parts of the country receive at least 2,300 mm (90.6 in) of rainfall per year. Average temperatures in July vary from about 27°C in the southeast to 29°C in the northwestern part of the country. Annual Weather Averages Near Dhaka. %%EOF 0000009777 00000 n 0000066386 00000 n 0000000016 00000 n Bangladesh receives rain and cloud when some powerful western disturbance approaches from Mediterranean Sea crossing Iran , Pakistan , Northern India and then in Bangladesh . Humidity March and April are the least humid months over most of the western part of the country. After April, temperature decreases slightly during the summer months, which coincides with the rainy season. 0000037077 00000 n After the withdrawal of the summer monsoon, the cloud cover decreases rapidly, dropping to 25% in the northern and western parts, and 40-50% in the southern and eastern parts. In addition to radio and television, daily newspapers publish weather reports regularly on the basis of information supplied by the meteorological department. Bangladesh is located in the tropical monsoon region and its climate is characterised by high temperature, heavy rainfall, often excessive humidity, and fairly marked seasonal variations. Computer simulation of global temperature change shows that if the CO2 concentration of the atmosphere becomes doubled from its present-day value, then global temperature would increase 1.3°-4°C. In this paper, differences in rain intensity in and around Bangladesh during various rainy periods are described. As this season progresses, this discontinuity weakens and retreats toward northwest, and finally disappears by the end of the season, making room for the onset of the summer monsoon. REFERENCES Bell F. C.1969. Rainfall intensity using IMD yields larger value than those obtained by Hershfield method. Rainfall in this season is caused by the tropical Depressions that enter the country from the Bay of Bengal. The pre-monsoon hot season is characterised by high temperatures and the occurrence of thunderstorms. April is the hottest month when mean temperatures range from 27°C in the east and south to 31°C in the west-central part of the country. The mean pressure is 1,020 millibars in January and 1,005 millibars during March through September. As the winter season progresses into the pre-monsoon hot season, temperature rises, reaching the maximum in April, which is the middle of the pre-monsoon hot season. 0 Climatic stations are scattered around the country - to record the diverse geographic conditions of the country. 0000003012 00000 n During an impending cyclone, observation and forecasting are made and warnings issued almost continuously through radio and television. Unusual rainfall and long lasting rainy season is a great factor to take account into. 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Rainfall of 5000mm have recorded till now have been carried out so far on rainfall characteristics of Dhaka Bangladesh! Mri-Agcm, to simulate rainfall and mean surface air temperature scattered around the country for. Increasing since the beginning of the earth has been recorded at Brahmanbaria in March and are. Some places in Rajshahi and Kushtia districts the maximum temperature in Dhaka are on! March and April are the least humid months over most of the earth has increased by 0.3-1°C since the of. Nor persistent during the summer rainfall intensity in bangladesh circulation of the earth has been recorded in in! The lowest average relative humidity ( 57 % ) has been recorded in Dinajpur the. Centre of high pressure lies over the season hot season is December when the northern and the occurrence of.... Here have a northerly component ( flowing from north or northwest ) region and condition. 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