To understand the climate of Bangladesh it is very essential to find out the monthly and seasonal... more To understand the climate of Bangladesh it is very essential to find out the monthly and seasonal variation of climate parameters. As such temporal and spatial distribution of temperatures (maximum, minimum, and dry bulb), surface wind and rainfall are computed and analyzed. For detailed understanding monthly frequency of the minimum temperature thresholds with the ranges of less than 6°C, 6-8°C, 8-10°C, 10-15°C, 15-20°C, 20-25°C and greater than 25°C; maximum temperatures thresholds with the ranges of greater than 40°C, 38-40°C, 36-38°C, 30-36°C, 25-30°C, 20-25°C and less than 20°C; rainfall categories of light rain (1-10 mm), moderate rain (11-22 mm), moderately heavy rain (23-43 mm), heavy rain (44-88 mm), very heavy rain with greater than 88 mm, very heavy rain with 100-199 mm, very heavy rain with 200-299 mm and very heavy rain with greater than 300 mm etc. are calculated for all the meteorological stations for the period of 1981-2010. In addition seasonal wind distribution of each of the BMD stations are prepared. Trends of these parameters are also analyzed. Finally, spatio-temporal variations of these parameters are calculated for the period of 1981-2010 and then the deviations of the later period than the previous period are checked. Distribution pattern of annual rainfall during 1971-2000 and 1981-2010 are very similar to each other. But the amounts of annual rainfall increased during 1981-2010 over extreme southeastern part, Hatiya, Sandwip, Rangpur and Jessore regions. But the amounts of rainfall decreased over Rajshahi division and the regions of Faridpur, Dhaka, Sylhet, Kushtia and Barisal. Substantial increments are found at Hatiya (+9%), Teknaf (+8%) and Jessore (+7%). Annual maximum temperature of 1981-2010 increased than that of 1971-2000 notably over southeastern and northeastern parts and then central and southern parts of Bangladesh but it decreased over the regions of Dinajpur, Mymensingh and Feni . The highest increment of annual maximum temperature of 0.5ºC is found at Cox's Bazar, Rangamati and Sylhet. Similarly, annual minimum temperature increased notably over northeastern and central parts of Bangladesh and their adjoining areas. The highest increment of minimum temperature of 0.3ºC is found at Dhaka, Faridpur, Madaripur, Maijdi Court, Cox's Bazar, Sylhet, Srimongal, Rangpur and Bhola.
To understand the climate of Bangladesh it is very essential to find out the monthly and seasonal... more To understand the climate of Bangladesh it is very essential to find out the monthly and seasonal variation of climate parameters. As such temporal and spatial distribution of temperatures (maximum, minimum, and dry bulb), surface wind and rainfall are computed and analyzed. For detailed understanding monthly frequency of the minimum temperature thresholds with the ranges of less than 6°C, 6-8°C, 8-10°C, 10-15°C, 15-20°C, 20-25°C and greater than 25°C; maximum temperatures thresholds with the ranges of greater than 40°C, 38-40°C, 36-38°C, 30-36°C, 25-30°C, 20-25°C and less than 20°C; rainfall categories of light rain (1-10 mm), moderate rain (11-22 mm), moderately heavy rain (23-43 mm), heavy rain (44-88 mm), very heavy rain with greater than 88 mm, very heavy rain with 100-199 mm, very heavy rain with 200-299 mm and very heavy rain with greater than 300 mm etc. are calculated for all the meteorological stations for the period of 1981-2010. In addition seasonal wind distribution of each of the BMD stations are prepared. Trends of these parameters are also analyzed. Finally, spatio-temporal variations of these parameters are calculated for the period of 1981-2010 and then the deviations of the later period than the previous period are checked. Distribution pattern of annual rainfall during 1971-2000 and 1981-2010 are very similar to each other. But the amounts of annual rainfall increased during 1981-2010 over extreme southeastern part, Hatiya, Sandwip, Rangpur and Jessore regions. But the amounts of rainfall decreased over Rajshahi division and the regions of Faridpur, Dhaka, Sylhet, Kushtia and Barisal. Substantial increments are found at Hatiya (+9%), Teknaf (+8%) and Jessore (+7%). Annual maximum temperature of 1981-2010 increased than that of 1971-2000 notably over southeastern and northeastern parts and then central and southern parts of Bangladesh but it decreased over the regions of Dinajpur, Mymensingh and Feni . The highest increment of annual maximum temperature of 0.5ºC is found at Cox's Bazar, Rangamati and Sylhet. Similarly, annual minimum temperature increased notably over northeastern and central parts of Bangladesh and their adjoining areas. The highest increment of minimum temperature of 0.3ºC is found at Dhaka, Faridpur, Madaripur, Maijdi Court, Cox's Bazar, Sylhet, Srimongal, Rangpur and Bhola.
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