This page has been accessed 36,907 times. ËD$NÈWi. Rainfall during the rainy season is caused by the tropical depressions that enter the country from the Bay of Bengal. The average annual discharge from … Average temperatures in April vary from about 27°C in the northeast to 30°C in the extreme west central part of the country. 0000013069 00000 n In July, rainfall amounts to 800 mm (31.5 in) in Sylhet, to 750 mm (29.5 in) in Chittagong, to 900 mm (35.5 in) in Cox's Bazar, and to as high as 1,000 mm (40 in) in Teknaf. 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. Annual Weather Averages Near Rajshahi. curves, which give a plot of rainfall intensity versus rainfall duration and recurrence interval. Environment. So, the prevailing wind direction in Bangladesh during the summer season has generally a southerly component (flowing from the south, southwest or southeast). Design/methodology/approach – The model generated rainfall was calibrated with ground-based observed data in Bangladesh … Rainfall intensity using IMD yields larger value than those obtained by Hershfield method. Climate Report; Report on Roanu; Report on MORA; Newsletter. On the other hand, temperature increase would be much higher in the middle and high latitude regions (5°-9°C). A trend analysis over Dhaka city … If this trend continues, then it will reach 450 ppmV by the year 2050. startxref Academia.edu is a platform for academics to share research papers. The lowest average relative humidity (57%) has been recorded in Dinajpur in the month of March. After the month of April, the temperature dampens due to increased cloud cover. 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. An average annual rainfall of 5000mm have recorded till now. 0000036879 00000 n 0000009549 00000 n This page was last modified on 2 December 2014, at 16:41. This is the only source of winter in Bangladesh . Precipitation in Bangladesh averaged 202.39 mm from 1901 until 2015, reaching an all time high of 1005.33 mm in September of 1934 and a record low of 0.01 mm in December of 1993. 0000002173 00000 n 0000063716 00000 n Murshed, A.K.M. Few techniques are already developed for specific region and climate condition of the world with different time and space domain. Winter (November … 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. 0000005555 00000 n As a result, a stream of warm and moist air from the Bay of Bengal flows toward the above-mentioned low pressure through Bangladesh (similar flow prevails from the Arabian Sea toward India). Averages are for Dhaka, which is 4 miles from Dhaka. 0000003825 00000 n 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. xref It is generally claimed that the temperature of the earth has been increasing since the beginning of the 20th century. 0000036617 00000 n Annual Weather Averages Near Dhaka. ... Total Rainfall: total cumulative precipitation (in mm) falling over the season. This wind is the part of the winter monsoon circulation of the South Asian subcontinent. From the climatic point of view, three distinct seasons can be recognised in Bangladesh - the cool dry season from November through February, the pre-monsoon hot season from March through May, and the rainy monsoon season which lasts from June through October. 0000010875 00000 n Observation and interpretation of satellite and radar imageries are important for prediction of severe weather and cyclones. The climate is tropical in Dhaka. Scarcity or heavy - both rainfall effects rural and urban life to a great extent with the changing pattern of the climate. Rainfall The single most dominant element of the climate of Bangladesh is the rainfall. However, with the progression of this season wind speed increases, and the wind direction becomes more persistent. 0000004360 00000 n Humidity March and April are the least humid months over most of the western part of the country. The average temperature in Dhaka is 25.9 °C | 78.6 °F. Weather report Bangladesh Meteorological Department prepares the weather reports of the country. 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. Rainfall at station above 50 millimeters are shown in red.red. Rainfall during this season varies from less than 2 cm in the west and south to slightly over 4 cm in the northeast. MRI-AGCM, to simulate rainfall and mean surface air temperature. 0000001693 00000 n Normal Monthly Rainfall; Normal Monthly Rainy Day; Daily Normal Rainfall; Daily Normal Maximum Temperature; Daily Normal Minimum Temperature; Temperature Data; Extreme Rainfall; Publications. Precipitation in Bangladesh increased to 5.94 mm in December from 5.07 mm in November of 2015. This narrow zone of discontinuity lies between the hot dry air coming from the upper Gangetic plain and the warm moist air coming from the Bay of Bengal. In the months of July and August, which is the middle of the rainy season, the cloud cover varies from 75 to 90% all over the country. The month of March may also be considered as the spring season, and the period from mid-October through mid-November may be called the autumn season. During the early part of this season, the winds are neither strong nor persistent. Rainfall in this season is caused by the tropical Depressions that enter the country from the Bay of Bengal. Bangladesh receives rain and cloud when some powerful western disturbance approaches from Mediterranean Sea crossing Iran , Pakistan , Northern India and then in Bangladesh . Bangladesh occupies an area of 1, 47,570 square Kilometers, has a sub-tropical monsoon climate characterized by wide seasonal variations in rainfall, moderately warm … In this paper, differences in rain intensity in and around Bangladesh during various rainy periods are described. However, not all scientists subscribe to the global warming hypothesis. Data and Resources. The maximum rainfall occurs at Sylhet in the north-eastern part and along the coastline in the southern part and with a minimum in … Except the hilly southeast, most of the country is a low-lying plainland. Rainfall Intensity: the average daily precipitation over the season considering only wet days. [Rafique Ahmed]. 0000000016 00000 n The groundwater, however, provides adequate storage to compensate for annual variations in rainfall and stream flow. Find the best time to go to Dhaka. 0000003527 00000 n Most of the earlier studies concerning the PCI have been carried … Go to resource. Although few studies have reported intensity and rainfall circulation in various regions (Shahid, 2010; Rahman et al., 2016; Zannat et al., 2019) and long-range variations in precipitation across Bangladesh (Ahmed et al., 2017; Burkart and Kinney, 2016). The major climatic stations from which long-term climatic data are available are - Barisal, Bhola, Bogra, Chittagong, Comilla, Cox's Bazar, Dhaka, Dinajpur, Faridpur, Feni, Hatiya, Ishwardi, Jessore, Khepupara, Khulna, Kutubdia, Madaripur, Maijdi Court, Mymensingh, Patuakhali, Rajshahi, Rangamati, Rangpur, Saidpur, Sandwip, Sitakunda, Sreemangal, Sylhet and Teknaf. To its south lies the bay of bengal, and to the west lie the plainland of west bengal and the vast tract of the Gangetic Plain. Thus, a better understanding of rainfall variations has important implications for the economy and society of Bangladesh. A stream of cold air flows eastward from this high pressure and enters the country through its northeast corner by changing its course clockwise, almost right-angle. On an average, the cloud cover in this season is about 10% almost all over the country. 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. During this season, wind inside the country generally have a northerly component (flowing from north or northwest). The mean rainfall during the monsoon season ranges from 1000 mm to 3000 mm in the country. The monsoon is less intense in the west, where the annual rainfall is around 1,500/1,600 mm (60/63 in), with a maximum in July of about 300/350 mm (12/13.5 … 0000007479 00000 n The average annual rainfall at Bangladesh varies from a maximum of 5,690 mm in the northeast of the country to minimum of 1,110 mm in the west. IDF curves and relationships presented in this paper will be useful for estimation of storm runoff of urban areas of major cities of Bangladesh. Average rainy days during the season vary from 60 in the west-central part to 95 days in the southeastern and over 100 days in the northeastern part. 0000002096 00000 n 0000006453 00000 n Now a day, erratic rainfall becomes very common in Bangladesh. The groundwater, however, provides adequate storage to compensate for annual variations in rainfall and stream flow. 0000063522 00000 n Climatic stations Bangladesh Meteorological Department is responsible for observation, recording and archiving of climatic data for various stations in the country. IDF curve was developed for North-East region of Bangladesh and also found that the rainfall data in this region follow Gumbel‟s Extreme Value Distribution [4]. It has been estimated by some scientists that the concentration of CO2 in the atmosphere during the pre-industrial period was 285-290 ppmV (parts per million by volume). The mean pressure is 1,020 millibars in January and 1,005 millibars during March through September. 0000001136 00000 n Rainfall. 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. Generalized Rainfall Intensity-Duration Frequency … Rainfall Table; Water Level Table; Forecast & Warning . Climate Report; Report on Roanu; Report on MORA; Newsletter. Volume(N3) Issue3(Vn3) Issue4(Vn3) Issue5(Vn3) Volume(N4) … trailer 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. 0000011030 00000 n During the summer monsoon season, which is also the rainy season, the cloud cover is very widespread. 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. Moreover, there will be differential temperature increase in summer and winter - temperature increase in the winter season will be higher than that in the summer. Dry Period Bulletin; Extended Range (1-15 Days) Flow Forecast (Experimental ) Special Outlook; Map. The pre-monsoon hot season is characterised by high temperatures and the occurrence of thunderstorms. %%EOF Climatic change Any climatic change in Bangladesh will, of course, be a part of worldwide climatic changes. Based on weather reports collected during 2005–2015. %PDF-1.4 %âãÏÓ developed to estimate near real-time rainfall in Bangladesh using satellite data. The average relative humidity for the whole year ranges from 78.1% at Cox's Bazar to 70.5% at Pabna. Volume(N3) Issue3(Vn3) Issue4(Vn3) Issue5(Vn3) Volume(N4) … 0000004192 00000 n Normal Monthly Rainfall; Normal Monthly Rainy Day; Daily Normal Rainfall; Daily Normal Maximum Temperature; Daily Normal Minimum Temperature; Temperature Data; Extreme Rainfall; Publications. Bangladesh Today; Bangladesh 24hr Forecast; Bangladesh 48hr Forecast; Bangladesh 72hr Forecast; Bangladesh 96hr Forecast; Bangladesh … 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. Saiful Islam, M. Shah Alam Khan, Impact of climate change on rainfall intensity in Bangladesh, in 3rd International Conference on Water and Flood Management, ICWFM, 2011 Google Scholar However, there is a distinct seasonal pattern in the annual cycle of rainfall, which is much more pronounced than the annual cycle of temperature. 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). It is surrounded by the Assam Hills in the east, the Meghalaya Plateau in the north, the lofty Himalayas lying farther to the north. Climatic stations are scattered around the country - to record the diverse geographic conditions of the country. 0000004805 00000 n These account for 70% of the annual total in the eastern part, 80% in the southwest, and slightly over 85% in the northwestern part of Bangladesh. 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. 2. 0000012029 00000 n In addition to radio and television, daily newspapers publish weather reports regularly on the basis of information supplied by the meteorological department. 0000010017 00000 n 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. 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. 238 0 obj<> endobj The dry season begins first in the west-central part of the country by mid-December, where its duration is about four months, and it advances toward east and south, reaching the eastern and southern margins of the country by mid-March where its duration is about one month. The relative humidity is everywhere over 80% during June through September. S.B. Here the lowest monthly average of 58.5% has been recorded at Brahmanbaria in March. The additional uplifting (by the Meghalaya Plateau) of the moist air causes higher amount of rainfall in the northeast. Temperature January is the coldest month in Bangladesh. Dataset Info These fields are compatible with DCAT, an RDF vocabulary designed to facilitate interoperability between data catalogs published … 0000003258 00000 n 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 … 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. Averages are for Rajshahi, which is 6 miles from Rajshahi. The pre-monsoon season is the transition period when the northerly or northwesterly winds of the winter season gradually changes to the southerly or southwesterly winds of the summer monsoon or rainy season (June-September). 240 0 obj<>stream During an impending cyclone, observation and forecasting are made and warnings issued almost continuously through radio and television. At present, the rain-gauges over Bangladesh are the only tool by which to measure rainfall, so Generally, winds are stronger in summer (8-16 km/hr) than in winter (3-6 km/hr). Bibliography Rafique Ahmed, Abhaoa O Jalabayu Vijnan (Meteorology and Climatology, written in Bangla), MS Alam, Department of Geography and Environmental Studies, University of Rajshahi, Bangladesh, 1997; RG Barry and RJ Chorley, Atmosphere, Weather and Climate, Routledge, London and New York, 1998. http://en.banglapedia.org/index.php?title=Climate&oldid=16046. 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. Sylhet is the areas in Bangladesh where maximum rainfall occur. 0000001883 00000 n As a consequence, it is estimated that the sea level will rise 2-3 metres by the year 2050. This phenomenon, called global warming, is attributed to the increase in atmospheric carbon dioxide (CO2) due to the burning of fossil fuel. CLIMATE OF BANGLADESH . After April, temperature decreases slightly during the summer months, which coincides with the rainy season. 0000001609 00000 n In the present climate, annual precipitation over the domain ranges from 500 mm (Tibet) to 2500 mm (Bangladesh). In a year, the rainfall … Weather bulletins and forecasting by the Bangladesh Meteorological Department for 6-hour, 12-hour and 24-hour periods are broadcast on radio and television. 0000008496 00000 n The least humid months in the eastern areas are January to March. 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. 0000052579 00000 n 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 details of data are analysed, interpreted and mapped here. 0000005087 00000 n The winter season is very dry, and accounts for only 2%-4% of the total annual rainfall. Average temperatures in July vary from about 27°C in the southeast to 29°C in the northwestern part of the country. There are four main seasons: the pre-monsoon (March-May), which has the highest temperatures and experiences the maximum intensity of cyclonic Rainfall during this season accounts for 10%-25% of the total annual rainfall which is caused by the thunderstorms or nor’wester (locally called Kalbaixakhi [Kalbaishakhi]). 0000010704 00000 n Bangladesh has a tropical monsoon climate with significant variations in rainfall and temperature throughout the country. Clouds In Bangladesh, the cloud cover has two opposing seasonal patterns, coinciding with the winter monsoon and the summer monsoon. The summers here have a good deal of rainfall, while the winters have very little. If this prediction comes true, then a significant area of the southern half of Bangladesh will be submerged by the Bay of Bengal. 0000014915 00000 n 0000063253 00000 n Based on weather reports collected during 2005–2015. Because of the country's location in the tropical monsoon region, the amount of rainfall is very high. Bangladesh Historical Precipitation Monitoring. Geographical location and physical settings govern the climate of any country. The average annual discharge from the three major rivers - a … Geographic distribution of annual rainfall shows a variation from 150 cm in the west-central part of the country to more than 400 cm in the northeastern and southeastern parts. The driest month of the season is December when the northern and the western districts get hardly 3 -10 mm of rainfall . Data on Daily and Monthly aggregate of rainfall of the whole of Bangladesh. 0000037077 00000 n Only few researches have been carried out so far on rainfall characteristics of Dhaka and Bangladesh. Rainfall Distribution Map; Inundation Map. In low and tropical latitudes the change would be very small (only 0.05°-0.25°C). REFERENCES Bell F. C.1969. Rainfall prediction is very important for the Bangladesh economy and day to day life. Bangladesh : Rainfall & Weather. Average temperatures in January vary from about 17'C in the northwestern and northeastern parts to 20°-21°C in the coastal areas. The rainfall in Bangladesh varies, depending upon season and location. Dhaka, Bangladesh - Hourly past weather, almanac for Dhaka including historical temperature, wind, rain, pressure and humidity stats | WorldWeatherOnline.com Realtime weather, 14 day weather forecast, historical weather at … Through calibration and validation the MRI-AGCM was adapted for Bangladesh for generating rainfall and temperature scenarios. 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. Bangladesh extends from 20°34'N to 26°38'N latitude and from 88°01'E to 92°41'E longitude. 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. During the winter season, a centre of high pressure lies over the northwestern part of India. 0 A second maximum is centered in Assam, which covers a smaller area, with higher intensity intense (250 mm/year), and better agreement among the models than the first maximum. Unusual rainfall and long lasting rainy season is a great factor to take account into. This page includes a chart with historical data for Bangladesh … In the western part, summer temperature sometimes reaches upto 40°C. 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. Observed concentration of CO2 in the atmosphere at the Muana Loa Observatory in Hawaii shows an increasing trend, from 315 ppmV in 1958 to 352 ppmV in 1988. Heavy rainfall is characteristic of Bangladesh causing it to flood every year. Average precipitation (rainfall, snow) in millimeter per month in Dhaka, Bangladesh displayed in a beautiful overview. Actually climatic changes on a global scale do not occur overnight; in fact, they occur only over a time scale of thousands of years. According to some analysts, the effects of increased temperature will have both destructive and beneficial consequences - destructive to some areas and beneficial to other areas. With the progression of the season, the cloud cover increases, reaching 50-60% by the end of the pre-monsoon hot season. Climate change will increase around 5% of the country's rainfall by 2030 (Su et al., 2006) and small changes in mean and standard deviation will largely impact on rainfall intensity. Short duration ... the number of wet days (as defined above) during the season. The Köppen-Geiger climate classification is Aw. Every day, all weather stations around the country transmit their recorded data electronically to the Headquarters of the meteorological department in Dhaka. 0000004948 00000 n This wind is the part of the summer monsoon circulation of the sub-continent. However, wind directions during the transition seasons (in spring and autumn) are variable. 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. Daily Rainfall Data 1007. 0000002459 00000 n 0000066386 00000 n Widespread cloud covers causes dampening of temperature during the later part of the pre-monsoon season. As a result of the flow of cold-dry winds from the northwestern part of India during the winter season, the cloud cover is at a minimum. 0000009777 00000 n 0000014182 00000 n <<2981f3b99c3d9341b96d8b973ad39fe6>]>> 0000025793 00000 n However, it is more extensive in the southern and eastern parts (90%) than in the northwestern part (75%). Climate the average condition of the atmosphere near the earth's surface over a long period of time, taking into account temperature, precipitation, humidity, wind, cloud, barometric pressure, etc. Daily Rainfall Data . 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. 238 42 xÚb```f``9ÂÀÁÀ dÌ È€ ‚l@ÈÂÀ¡ÂÌÁÆ´Œ‰¡ôȉ:eâë~êXÄÀP¸]2+m&6Àqáœ`ª¿ÈƓ Global warming will cause the polar ice caps and Himalayan ice caps to melt at a slow pace. 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). In some places in Rajshahi and Kushtia districts the maximum temperature in summer season rises up to 40°C or more. 0000003789 00000 n 0000002756 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. More than 70% of Bangladesh's annual rainfall occurs in the monsoon (June- September) season. Atmospheric pressure and winds These are characterised by seasonal reversals between summer and winter in Bangladesh. Rainfall water that is condensed from the aqueous vapour in the atmosphere and falls in drops from the sky to the earth is called rain; and the total amount of rain that falls in a particular area within a certain time is called rainfall. 0000003012 00000 n The amount is slightly enhanced in the northeastern part due to the additional uplifting of moist air provided by the Meghalaya Plateau. However, there is another side to the argument. The details of data are analysed, interpreted and mapped here clouds in Bangladesh,! Or more will cause the polar ice caps and Himalayan ice caps to melt at a pace. In Dhaka day to day life areas in Bangladesh, the cloud cover is very dry, the... Bay of Bengal the driest month of the climate the Bay of Bengal latitude regions ( 5°-9°C ), all. 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Every year intensity: the average relative humidity for the whole of causing. In rain intensity in and around Bangladesh during various rainy periods are broadcast on radio and.! Increase would be very small ( only 0.05°-0.25°C ) 3000 mm in the and. Urban areas of major cities of Bangladesh 's annual rainfall a good deal rainfall... Mm ( Bangladesh ) becomes more persistent C in the middle and high latitude regions ( 5°-9°C ) of. In Bangladesh, the cloud cover increases, reaching 50-60 % by year! Are characterised by seasonal reversals between summer and winter in Bangladesh where maximum rainfall occur and mean air!