Analyzing Historical Temperature Variation in Dhaka, Bangladesh in Climate Change Perspective: Fid-Bau Portal

Analyzing Historical Temperature Variation in Dhaka, Bangladesh in Climate Change Perspective

Rudaiba, A. / Mamtaz, R.

Climate change is a major environmental hazard in the twenty-first century. This long-term weather change threatens all living species. Temperature is the best climatic indicator. Identifying and evaluating historical temperature fluctuations is vital to climate change research, and scientists from many nations are working on it. Dhaka, Bangladesh’s capital, is a climate-vulnerable metropolis. In this study, an attempt has been made to analyze temperature variations from 1980 to 2020. Using linear regression and the Mann–Kendall test, the long-term trend of historical temperature change was examined. The findings of both studies were quite comparable, except for March's monthly average maximum temperature. Every month of the year had a noticeable rising trend in the monthly average minimum temperature. Between 2010 and 2019, both the monthly average maximum temperature and the monthly average minimum temperature increased significantly. Over this period, the rate of increase of monthly average maximum temperature for September is 1.3 °C/decade, and the rate of increase of monthly average minimum temperature for December is 1.6 °C/decade. The average maximum temperature during the hottest months—March, April, and May—and the average minimum temperature during the coldest months—December, January, and February—both increased by about 0.15 and 0.45 °C for every decade, respectively. Rising trends of 0.15 °C/decade and 0.28 °C/decade were seen in the average annual maximum and minimum temperatures. The number of hot days per decade with maximum temperature exceeding 30 and 35 °C grew by 7.3 and 30%, respectively, from 1980 to 2020. For the same period, the number of cold days per decade having a minimum temperature of less than 15 and 10 °C dropped by 27.8 and 54.8%, respectively. The study reveals a rising trend in Dhaka's temperature.