Winter (October-March) is cool and mild. Summer (March-June) is hot and humid. The monsoon season (June-October) brings most of Bangladesh's yearly rain; floods, tidal waves, and cyclones are common. Bangladesh has one of the wettest climates in the world. Most places get more than 1,525 mm a year, and people near the hills get 5,080 mm. January is the coolest month with temperatures around 78 degrees F, and the warmest month is April with temps around 91-96 degrees F.
Bangladesh is about the same size as Wisconsin. Rivers and channels run through the country; the three largest rivers are the Padma, Jamuna, and Meghna. It's mostly fertile deltas and flat land with a few hilly areas in the southeast and northeast.
The picture is a view of Bangladesh from space.