Volume 11, Issue 29, January - June, 2025

Annual and seasonal variability of historical climatic parameters of Bangladesh

Md. Abu Zafur Al-Munsur¹, Md. Shahidul Islam², Ferzana Islam³, Parimal Kanti Biswas⁴, Mirza Hasanuzzaman², Md. Ismail Hossain⁵

¹Deputy Director, Department of Agricultural Extension, Ministry of Agriculture, Bangladesh
²Professor, Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka -1207, Bangladesh
³Professor, Department of Agroforestry and Environmental Science, Sher-e-Bangla Agricultural University, Dhaka -1207, Bangladesh
⁴Ex Professor, Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka -1207, Bangladesh
⁵Professor, Department of Horticulture, Sher-e-Bangla Agricultural University, Dhaka -1207, Bangladesh

ABSTRACT

We analyzed the annual and seasonal variability of historical climatic parameters (temperature and rainfall) for eight divisions of Bangladesh. The linear trend of 40 years of data from 1981-to 2020 was analyzed for annual, pre-monsoon, monsoon, post-monsoon, and winter seasons. Annual maximum and minimum temperatures ranged from 29.1-32.6 °C and 19.0-23.1 °C, respectively, among the places. Premonsoons experienced the highest maximum temperatures, whereas monsoons received the highest minimum temperatures in the locations. Sylhet received the maximum (4113 mm) annual rainfall, whereas Rajshahi had the yearly minimum (1429 mm). Annual maximum and minimum temperatures showed an increasing trend in all locations. However, the rising maximum temperature rate was alarming (over one °C) in Sylhet, Chattogram, and Khulna. However, the minimum temperature increasing trend was critical (over one °C) in Sylhet, Rangpur, Dhaka, and Khulna. During the pre-monsoon season, the maximum temperature increased by 2.3 °C at Chattogram and the minimum 0.07 °C at Mymensingh. Annual rainfall is decreased in all locations except Chattogram. However, pre-monsoon rainfall increased in Rangpur, Sylhet, and Rajshahi, and monsoon rainfall decreased in all locations except Chattogram and Khulna. Since temperature and rainfall patterns have greatly influenced agriculture-based countries like Bangladesh, changing pattern analysis is necessary for crop planning. Moreover, these associated changes may threaten the significant achievements. Bangladesh has made so far over the last two decades in increasing incomes and reducing poverty. In this regard, it was necessary to regularly and systematically compile, monitor, and analyze the relevant climatic parameters for assessing the impacts of climate change.

Keywords: Annual and seasonal variability, historical, climatic parameters, Bangladesh, Rainfall, Temperature

Climate Change, 2025, 11(29), e3cc1057

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DOI: https://doi.org/10.54905/disssi.v11i29.e3cc1057

Published: 07 January 2025