2025, 2050, 2075 and 2100 are given in Tables 3 and 4 respectively. These rainfall
and temperature values are used in the present study for the calculation of change in
irrigation water demand.
The climate models estimate a steady increase in temperature for Bangladesh.
More warming is estimated in winter compared to summer. The models predict an
average increase of temperature 0.8◦C in 2025, 1.4◦C in 2050, 1.9◦C in 2075, and
2.4◦C in 2100. A maximum increase of temperature in January, about 3◦C in 2100 and
minimum increase of temperature in July, about 1.4◦C in 2100 are projected. In case
of rainfall, the models show an annual increase of rainfall. Most of the climate models
estimate that estimate that precipitation will increase during the summer monsoon
as the air over land will warm more than the air over oceans during summer. The
models also show a decrease in precipitation in the winter months of December,
January and February. Maximum increase of rainfall is predicted for the month of
August, about 1.2 mm/day in 2100 and a maximum decrease of rainfall in December,
about 0.4 mm/day in 2100.