Padma Multipurpose Bridge Project

Figure 3-11: Monthly rainfall in Madaripur26. Humidity: Annual average relative humidity at Dhaka is 73%. Generally all months havethe days with a monthly maximum humidity of more than 94% in both Dhaka and Madaripur (Table3-6). The lowest daily humidity recorded is 6% in Dhaka and 15% in Madaripur.Table 3-6: Maximum and minimum monthly humidity at Dhaka and MadaripurMonthDhakaMadaripur2005 2006 2007 2008 2005 2006 2007 2008MaxMinMaxMinMaxMinMaxMinMaxMinMaxMinMaxMinMaxMinJan 97 28 100 21 100 20 98 25 99 32 100 34 100 24 100 29Feb 97 17 98 15 100 23 96 13 98 26 98 30 100 31 100 22Mar 98 18 96 6 96 14 95 28 98 29 98 15 100 22 98 35Apr 94 27 96 28 95 32 94 23 97 35 98 33 97 41 98 32May 98 44 98 40 98 33 96 37 98 50 98 45 96 42 98 45Jun 98 46 99 57 98 52 98 51 97 53 97 62 97 59 100 61Jul 99 57 98 55 99 55 98 61 100 64 99 61 97 56 98 65Aug 97 55 95 52 98 50 97 57 99 64 99 60 96 57 98 63Sep 98 52 99 51 98 42 98 53 100 56 98 55 97 61 98 61Oct 98 34 98 38 98 31 98 32 99 43 97 50 100 45 99 48Nov 98 32 95 26 99 35 97 29 100 40 97 40 100 43 99 38Dec 98 24 97 29 98 28 99 33 100 36 100 38 100 33 100 37Source: Bangladesh Meteorological Department, 2009.27. Wind: Maximum wind speed and direction recorded at Dhaka and Madaripur stations forthe years 2005-2008 are given in Table 3-7. A summary of all the data is presented as wind roses inFigure 3-12. The wind direction at Dhaka station is generally towards south-east direction, while thewind direction at Madaripur is towards southern direction. Maximum wind speed recorded in Dhaka is22 knots in the eastern direction (October 2007). Maximum wind speed recorded at Madaripur Stationis 70 knots in the direction of north-east (November 2007).3-13