Some have automatic systems which record wind-speed data onto paper rolls but most measurements are recorded by office stuff. These are collected and set to the Headquarters in Dhaka where they are entered on computer and made available at an agreed cost to interested parties in addition to their being used for whether forecasting purposes. From experience reported by those interested in wind energy in measurements at low heights and relatively inaccurate instruments. Despite considerable drawbacks, these measurements are the only source of wind speed information available in Bangladesh. Wind speed exhibits a strong seasonal cycle, lowest in the winter and higher in the summer.
Wind speed exhibits a diurnal cycle, generally peaking at noon and weakest at night.
Finally seven locations were selected which were equitably dispersed along the vast coastline in the district of Cox's Bazar, Chittagong, Noakhali, Bhola and Potuakhali. The average monthly values showed that wind-speed is relatively high during the months of April through August and low during September to March. Mean monthly wind-speed data showed that among the seven stations, the highest values were observed in different months ranging from November to February. Wind speed values were found to be positively correlated with height. The recorded data at two heights for Char Fassion station show that mean wind speed values in all the months are consistently higher at 25 m height than at 10 m height.