Table of Contents

ABSTRACT

Bangladesh experiences the rainy season at varying times each year, making it imperative to comprehend the changes in the arrival and departure of this season since the nation’s economy is closely linked to it. To address this issue, a study was conducted to investigate 35 years of daily precipitation data in the rainy season (May to October) at Dhaka, Mymensingh, Barisal, and Patuakhali stations, as well as to assess when the rainy season began and ended in the country’s central region. The four selected locations were used to establish the arrival and departure times of the rainy season for different years using the Ahmed and Karmakar (1993) method. The North-Central region and South-Central region of Bangladesh experience the rainy season from May 19th to October 3rd and May 22nd to October 7th, respectively. The average duration of the rainy season is 138 and 139 days for the North-Central and South-Central regions, respectively, with 78 and 84 rain days, and rainfall amounts of 1745 mm and 1942 mm, respectively. Furthermore, the average arrival and withdrawal dates indicate that the rainy season begins first in the North-Central region and then gradually moves towards the South-Central. Therefore, the findings of this study provide valuable insights into the timing of the rainy season in Bangladesh, which could have significant implications for the country’s agricultural, industrial, and economic sectors.

Keywords: rainy season, arrival of rainy season, withdrawal of rainy season, seasonal rainfall, rainy season in Bangladesh