Climate of Bangladesh

Summary

Bangladesh has a tropical monsoon climate marked by a hot pre-monsoon season, a wet summer monsoon and a cooler, drier winter.

Core concept

Understand the system

Bangladesh has a tropical monsoon climate marked by a hot pre-monsoon season, a wet summer monsoon and a cooler, drier winter.

Why / how it happens

Causes and context

Bangladesh has a tropical monsoon climate marked by a hot pre-monsoon season, a wet summer monsoon and a cooler, drier winter. The governing relationship is: Seasonal reversal of winds, land-sea thermal contrast, Bay of Bengal moisture and the Himalayan-Tibetan setting organize rainfall and temperature.

Mechanism / process

Seasonal reversal of winds, land-sea thermal contrast, Bay of Bengal moisture and the Himalayan-Tibetan setting organize rainfall and temperature.

Key facts

• The monsoon supplies most annual rainfall in much of the country.
• Pre-monsoon thunderstorms, monsoon rain and post-monsoon cyclones are distinct seasonal hazards.
• Rainfall and temperature vary regionally, including wetter northeast and exposed coastal settings.

Important terminology

• monsoon
• seasonal reversal
• nor'wester
• humidity
• cyclone

Named examples / case studies

• Kalbaishakhi thunderstorms occur in the pre-monsoon season and can be locally severe.

Causes / components

• Key components: monsoon, seasonal reversal, nor'wester.
• Seasonal reversal of winds, land-sea thermal contrast, Bay of Bengal moisture and the Himalayan-Tibetan setting organize rainfall and temperature.

Effects / significance

• Pre-monsoon thunderstorms, monsoon rain and post-monsoon cyclones are distinct seasonal hazards.
• Rainfall and temperature vary regionally, including wetter northeast and exposed coastal settings.
• Application: Kalbaishakhi thunderstorms occur in the pre-monsoon season and can be locally severe.

Geography connection

Kalbaishakhi thunderstorms occur in the pre-monsoon season and can be locally severe. This illustrates how climate of bangladesh varies by location, scale or environmental context.

Bangladesh connection

Climate controls rice calendars, flood regimes, water availability, heat stress and cyclone exposure across Bangladesh.

BCS preliminary facts

• The monsoon supplies most annual rainfall in much of the country.
• Pre-monsoon thunderstorms, monsoon rain and post-monsoon cyclones are distinct seasonal hazards.
• Rainfall and temperature vary regionally, including wetter northeast and exposed coastal settings.

BCS written analysis

Build an analytical answer

• Bangladesh has a tropical monsoon climate marked by a hot pre-monsoon season, a wet summer monsoon and a cooler, drier winter.
• Seasonal reversal of winds, land-sea thermal contrast, Bay of Bengal moisture and the Himalayan-Tibetan setting organize rainfall and temperature. Use kalbaishakhi thunderstorms occur in the pre-monsoon season and can be locally severe. as a named application in a comparative answer.

Common misconceptions

• Monsoon means a seasonal wind reversal, not merely heavy rain.
• Bangladesh's climate is not spatially uniform despite its small area.

Quick revision

• Climate of Bangladesh
• The monsoon supplies most annual rainfall in much of the country.
• Pre-monsoon thunderstorms, monsoon rain and post-monsoon cyclones are distinct seasonal hazards.
• monsoon / seasonal reversal
• Definition → process → spatial example