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. Environment. The average annual discharge from the three major rivers - a … Generalized Rainfall Intensity-Duration Frequency … Humidity March and April are the least humid months over most of the western part of the country. 0000011030 00000 n Bangladesh Historical Precipitation Monitoring. The least humid months in the eastern areas are January to March. 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. 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. Rainfall Table; Water Level Table; Forecast & Warning . Rainfall during this season varies from less than 2 cm in the west and south to slightly over 4 cm in the northeast. Dry Period Bulletin; Extended Range (1-15 Days) Flow Forecast (Experimental ) Special Outlook; Map. Weather report Bangladesh Meteorological Department prepares the weather reports of the country. 0000003012 00000 n 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. 0 xref The Köppen-Geiger climate classification is Aw. 0000009777 00000 n 0000063522 00000 n Now a day, erratic rainfall becomes very common in Bangladesh. The average temperature in Dhaka is 25.9 °C | 78.6 °F. Because of the country's location in the tropical monsoon region, the amount of rainfall is very high. With the progression of the season, the cloud cover increases, reaching 50-60% by the end of the pre-monsoon hot season. Normal Monthly Rainfall; Normal Monthly Rainy Day; Daily Normal Rainfall; Daily Normal Maximum Temperature; Daily Normal Minimum Temperature; Temperature Data; Extreme Rainfall; Publications. Rainfall. 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. 0000004360 00000 n Academia.edu is a platform for academics to share research papers. 0000013069 00000 n Rainfall The single most dominant element of the climate of Bangladesh is the rainfall. Thus, a better understanding of rainfall variations has important implications for the economy and society of Bangladesh. 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. Climatic stations are scattered around the country - to record the diverse geographic conditions of the country. However, there is a distinct seasonal pattern in the annual cycle of rainfall, which is much more pronounced than the annual cycle of temperature. After April, temperature decreases slightly during the summer months, which coincides with the rainy season. 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. Data on Daily and Monthly aggregate of rainfall of the whole of Bangladesh. In the western part, summer temperature sometimes reaches upto 40°C. 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. 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]. 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. 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. This page was last modified on 2 December 2014, at 16:41. curves, which give a plot of rainfall intensity versus rainfall duration and recurrence interval. However, with the progression of this season wind speed increases, and the wind direction becomes more persistent. 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. Average precipitation (rainfall, snow) in millimeter per month in Dhaka, Bangladesh displayed in a beautiful overview. 0000010875 00000 n 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. Heavy rainfall is characteristic of Bangladesh causing it to flood every year. 2. IDF curves and relationships presented in this paper will be useful for estimation of storm runoff of urban areas of major cities of Bangladesh. The groundwater, however, provides adequate storage to compensate for annual variations in rainfall and stream flow. During the winter season, a centre of high pressure lies over the northwestern part of India. Temperature January is the coldest month in Bangladesh. A trend analysis over Dhaka city … 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. Atmospheric pressure and winds These are characterised by seasonal reversals between summer and winter in Bangladesh. Climatic change Any climatic change in Bangladesh will, of course, be a part of worldwide climatic changes. 0000036879 00000 n 0000003825 00000 n 0000003527 00000 n Data and Resources. The amount is slightly enhanced in the northeastern part due to the additional uplifting of moist air provided by the Meghalaya Plateau. Find the best time to go to Dhaka. 0000004192 00000 n Rainfall Intensity: the average daily precipitation over the season considering only wet days. 0000001693 00000 n However, not all scientists subscribe to the global warming hypothesis. 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. S.B. 0000003258 00000 n In low and tropical latitudes the change would be very small (only 0.05°-0.25°C). 0000010704 00000 n Averages are for Dhaka, which is 4 miles from Dhaka. Climatic stations Bangladesh Meteorological Department is responsible for observation, recording and archiving of climatic data for various stations in the country. 0000063716 00000 n Clouds In Bangladesh, the cloud cover has two opposing seasonal patterns, coinciding with the winter monsoon and the summer monsoon. 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 groundwater, however, provides adequate storage to compensate for annual variations in rainfall and stream flow. This page has been accessed 36,907 times. At present, the rain-gauges over Bangladesh are the only tool by which to measure rainfall, so 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). 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. MRI-AGCM, to simulate rainfall and mean surface air temperature. 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. The maximum rainfall occurs at Sylhet in the north-eastern part and along the coastline in the southern part and with a minimum in … xÚb```f``9ÂÀÁÀ dÌ È€ ‚l@ÈÂÀ¡ÂÌÁÆ´Œ‰¡ôȉ:eâë~êXÄÀP¸]2+m&6Àqáœ`ª¿ÈƓ Scarcity or heavy - both rainfall effects rural and urban life to a great extent with the changing pattern of the climate. 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. However, there is another side to the argument. Averages are for Rajshahi, which is 6 miles from Rajshahi. 0000066386 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. %PDF-1.4 %âãÏÓ The lowest average relative humidity (57%) has been recorded in Dinajpur in the month of March. Here the lowest monthly average of 58.5% has been recorded at Brahmanbaria in March. 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. CLIMATE OF BANGLADESH . Weather bulletins and forecasting by the Bangladesh Meteorological Department for 6-hour, 12-hour and 24-hour periods are broadcast on radio and television. 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). Only few researches have been carried out so far on rainfall characteristics of Dhaka and Bangladesh. This wind is the part of the summer monsoon circulation of the sub-continent. Every day, all weather stations around the country transmit their recorded data electronically to the Headquarters of the meteorological department in Dhaka. REFERENCES Bell F. C.1969. Precipitation in Bangladesh increased to 5.94 mm in December from 5.07 mm in November of 2015. 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. 0000002459 00000 n The relative humidity is everywhere over 80% during June through September. 0000003789 00000 n However, it is more extensive in the southern and eastern parts (90%) than in the northwestern part (75%). 0000063253 00000 n In some places in Rajshahi and Kushtia districts the maximum temperature in summer season rises up to 40°C or more. 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. 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. 0000002096 00000 n 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. Annual Weather Averages Near Dhaka. The mean rainfall during the monsoon season ranges from 1000 mm to 3000 mm in the country. Based on weather reports collected during 2005–2015. 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. 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. During an impending cyclone, observation and forecasting are made and warnings issued almost continuously through radio and television. Generally, winds are stronger in summer (8-16 km/hr) than in winter (3-6 km/hr). 0000036617 00000 n 0000001609 00000 n 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. Bangladesh : Rainfall & Weather. The winter season is very dry, and accounts for only 2%-4% of the total annual rainfall. 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 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 … Climate Report; Report on Roanu; Report on MORA; Newsletter. Design/methodology/approach – The model generated rainfall was calibrated with ground-based observed data in Bangladesh … Average temperatures in July vary from about 27°C in the southeast to 29°C in the northwestern part of the country. Daily Rainfall Data . 0000008496 00000 n 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). The rainfall in Bangladesh varies, depending upon season and location. This page includes a chart with historical data for Bangladesh … 0000001136 00000 n During the summer monsoon season, which is also the rainy season, the cloud cover is very widespread. Bangladesh extends from 20°34'N to 26°38'N latitude and from 88°01'E to 92°41'E longitude. Except the hilly southeast, most of the country is a low-lying plainland. 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 … If this trend continues, then it will reach 450 ppmV by the year 2050. Short duration The mean pressure is 1,020 millibars in January and 1,005 millibars during March through September. In the present climate, annual precipitation over the domain ranges from 500 mm (Tibet) to 2500 mm (Bangladesh). Bangladesh receives rain and cloud when some powerful western disturbance approaches from Mediterranean Sea crossing Iran , Pakistan , Northern India and then in Bangladesh . ËD$NÈWi. So, the prevailing wind direction in Bangladesh during the summer season has generally a southerly component (flowing from the south, southwest or southeast). 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]). In addition to radio and television, daily newspapers publish weather reports regularly on the basis of information supplied by the meteorological department. However, wind directions during the transition seasons (in spring and autumn) are variable. 0000005555 00000 n Average temperatures in April vary from about 27°C in the northeast to 30°C in the extreme west central part of the country. 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. 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. Daily Rainfall Data 1007. Actually climatic changes on a global scale do not occur overnight; in fact, they occur only over a time scale of thousands of years. developed to estimate near real-time rainfall in Bangladesh using satellite data. 0000009549 00000 n Rainfall intensity using IMD yields larger value than those obtained by Hershfield method. 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). startxref More than 70% of Bangladesh's annual rainfall occurs in the monsoon (June- September) season. Average temperatures in January vary from about 17'C in the northwestern and northeastern parts to 20°-21°C in the coastal areas. Rainfall prediction is very important for the Bangladesh economy and day to day life. 0000052579 00000 n Dataset Info These fields are compatible with DCAT, an RDF vocabulary designed to facilitate interoperability between data catalogs published … Widespread cloud covers causes dampening of temperature during the later part of the pre-monsoon season. This is the only source of winter in Bangladesh . 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. trailer The average annual discharge from … 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. 0000005087 00000 n ... the number of wet days (as defined above) during the season. 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. 0000001883 00000 n 238 42 Volume(N3) Issue3(Vn3) Issue4(Vn3) Issue5(Vn3) Volume(N4) … Go to resource. 0000002756 00000 n 0000010017 00000 n The average relative humidity for the whole year ranges from 78.1% at Cox's Bazar to 70.5% at Pabna. Climate Report; Report on Roanu; Report on MORA; Newsletter. Sylhet is the areas in Bangladesh where maximum rainfall occur. Few techniques are already developed for specific region and climate condition of the world with different time and space domain. 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). 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 … The climate is tropical in Dhaka. Rainfall at station above 50 millimeters are shown in red.red. 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). 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. 0000014182 00000 n Through calibration and validation the MRI-AGCM was adapted for Bangladesh for generating rainfall and temperature scenarios. 0000002173 00000 n Winter (November … After the month of April, the temperature dampens due to increased cloud cover. This phenomenon, called global warming, is attributed to the increase in atmospheric carbon dioxide (CO2) due to the burning of fossil fuel. 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. 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. ... Total Rainfall: total cumulative precipitation (in mm) falling over the season. 238 0 obj<> endobj Normal Monthly Rainfall; Normal Monthly Rainy Day; Daily Normal Rainfall; Daily Normal Maximum Temperature; Daily Normal Minimum Temperature; Temperature Data; Extreme Rainfall; Publications. 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. Murshed, A.K.M. It is surrounded by the Assam Hills in the east, the Meghalaya Plateau in the north, the lofty Himalayas lying farther to the north. 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And tropical latitudes the change would be very small ( only 0.05°-0.25°C ) South to slightly over cm!