Figure 1. Average Monthly Precipitation Levels (Mm) in Bangladesh from January to June

Figure 1. Average monthly precipitation levels (mm) in Bangladesh from January to June between 2002-2010. The slope of each months regression line (mm/year) is displayed within each plot.

Figure 2. Average monthly precipitation levels (mm) in Bangladesh from July to December between 2002-2010. The slope of each months regression line (mm/year) is displayed within each plot.

Figure 3. Average seasonal precipitation levels (mm) in Bangladesh between 2002-2010. The Bengal climate is divided into two seasons annually, wet and dry. Dry season occurs between November and April and wet season occurs between May and October. The slope of each seasons Seasonal Mann-Kendall trend line (mm/year) is displayed in the table within the plot.

Figure 4. Average monthly precipitation levels summarized by Administrative District between 2002-2010. The corresponding slope of each district’s regression line (mm/year) is displayed within each district’s plot.

Figure 5. Average monthly precipitation levels summarized by Administrative District between 2002-2010. The corresponding slope of each district’s regression line (mm/year) is displayed within each district’s plot.

Figure 6. Average monthly precipitation levels summarized by Administrative District between 2002-2010. The corresponding slope of each district’s regression line (mm/year) is displayed within each district’s plot.

Table 1. Results from a Seasonal Mann-Kendall test and corresponding Theil-Sen Slope estimator run on the average precipitation by Administrative District between 2002-2010. p-value column indicates significance of trend.
District / SMK tau / Seasonal MK Theil-Sen Slope (m/year) / SMK p-value
Barisal / 0.02 / 0.47 / 0.77
Bogra / -0.021 / -0.21 / 0.75
Comilla / 0.01 / 0.17 / 0.88
Dhaka / -0.014 / -0.19 / 0.83
Dinajpur / -0.01 / -0.045 / 0.88
Faridpur / -0.0052 / -0.063 / 0.94
Jamalpur / -0.029 / -0.46 / 0.66
Jessore / -0.0048 / -0.046 / 0.94
Khulna / 0.0045 / 0.085 / 0.95
Kishoreganj / -0.0052 / -0.062 / 0.94
Kushtia / -0.014 / -0.19 / 0.83
Mymensingh / -0.0038 / -0.074 / 0.96
Noakhali / 0.031 / 0.7 / 0.63
Pabna / -0.02 / -0.27 / 0.76
Patuakhali / 0.032 / 0.82 / 0.62
Rajshahi / -0.019 / -0.2 / 0.77
Ranpur / -0.025 / -0.27 / 0.70
Sylhet / -0.0054 / -0.092 / 0.94
Tangali / -0.029 / -0.39 / 0.66

Basin Level Precipitation Figures

Figure 7. Trends in precipitation (mm) between 2002-2010 in the Ganges Brahamputra Meghna Delta. The slope of the precipitation trend, derived by a Seasonal Mann-Kendall trend test, was 1.85 mm/year.

Figure 8. Average seasonal precipitation levels (mm) in the Ganges Brahmaputra Meghna Delta between 2002-2010. The regional climate is divided into two seasons annually, wet and dry. Dry season occurs between November and April and wet season occurs between May and October. The slope of each seasons Seasonal Mann-Kendall trend line (mm/year) is displayed in the table within the plot.

Figure 9. Average monthly precipitation levels (mm) in the Ganges Brahmaputra Meghna Delta from January to June between 2002-2010. The slope of each months Seasonal Mann-Kendall trend line (mm/year) is displayed within each plot.

Figure 10. Average monthly precipitation levels (mm) in the Ganges Brahmaputra Meghna Delta from July to December between 2002-2010. The slope of each months Seasonal Mann-Kendall trend line (mm/year) is displayed within each plot.