American Journal of Climate Change, 2018, 7, 115-134 http://www.scirp.org/journal/ajcc ISSN Online: 2167-9509 ISSN Print: 2167-9495 A Trend Analysis of Temperature and Rainfall to Predict Climate Change for Northwestern Region of Bangladesh Md. Didarul Islam Bhuyan 1* , Md. Mohymenul Islam 1 , Md. Ebrahim Khalil Bhuiyan 2 1 Department of Physics, Mawlana Bhashani Science and Technology University, Santosh, Tangail, Bangladesh 2 Department of Textile Engineering, Bangladesh University of Business and Technology, Dhaka, Bangladesh Abstract Bangladesh is one in all the foremost climate vulnerable countries of the world. In recent years, climate change studies over the country get plenty of attention by the researchers and policy makers. A substantial quantity of global climate change studies over the country use climate models to estimate future projections and uncertainties. Maximum temperature, precipitation and their potential future changes are evaluated in an ensemble of the 5th Phase Coupled Model Inter-comparison Project (CMIP5) within the Inter- governmental Panel on Climate Change (IPCC) diagnostic exercise for the Fifth Assessment Report (AR5) and the available historical data collected by the Bangladesh Meteorological Department (BMD) during the period 1981-2008 in the north-western region of Bangladesh and also the comparison between these two values. It has been found that average maximum temperature shows a positive trend of increase at a rate of 0.29˚C and 5.3˚C per century respec- tively, for BMD data and MPI-ESM-LR (CMIP5) model data. But the rainfall is decreasing at a rate of 8.8 mm and 40.1 mm per century respectively for BMD data and MPI-ESM-LR (CMIP5) model data. It is seen that July was the maximum monsoon rainfall month and January was the lowest rainfall month. The peak frequency is slightly smaller than 12 months, which indi- cates that the major events are occurring before ending a year compared to the previous year. According to MPI-ESM-LR (CMIP5) model data, future normal temperature on north-western region will be increased at a rate of 1.62˚C during the period 2040-2100. Keywords Trend Analysis, Mann-Kendall Test, Sen’s Slope Estimator, Z-Test, CMIP5 Model and Periodicity How to cite this paper: Bhuyan, M.D.I., Islam, M.M. and Bhuiyan, M.E.K. (2018) A Trend Analysis of Temperature and Rain- fall to Predict Climate Change for North- western Region of Bangladesh. American Journal of Climate Change, 7, 115-134. https://doi.org/10.4236/ajcc.2018.72009 Received: January 1, 2018 Accepted: April 15, 2018 Published: April 18, 2018 Copyright © 2018 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access DOI: 10.4236/ajcc.2018.72009 Apr. 18, 2018 115 American Journal of Climate Change