Retreating Monsoon Rainfall Explained

The question asks about the region that primarily receives rainfall from the retreating monsoon. The retreating monsoon, also known as the Northeast Monsoon, occurs during the winter months (typically from October to December). During this period, the atmospheric conditions change, leading the monsoon winds to withdraw from the northern and central parts of India.

Understanding Monsoon Wind Movement

Initially, the Southwest Monsoon brings heavy rainfall to most parts of India from June to September. As this system withdraws, the Northeast Monsoon begins. The winds during this phase blow from the land towards the sea (northeast to southwest). However, as these winds pass over the Bay of Bengal, they pick up moisture, which is then deposited as rainfall when they encounter the landmass along the southeastern coast of India.

Identifying the Primary Rainfall Region

Let's analyze the options provided:

• Assam: Located in Northeast India, Assam experiences its heaviest rainfall during the Southwest Monsoon season. The retreating monsoon winds have typically dried out by the time they reach this area and do not contribute significantly to its rainfall.
• Tamil Nadu: This state lies on the southeastern coast of India. The Coromandel Coast, which includes Tamil Nadu, faces the Bay of Bengal. Consequently, the moisture-laden winds of the Northeast (Retreating) Monsoon strike this coast, causing significant rainfall, especially during October, November, and December. This is why Tamil Nadu is known for receiving substantial rainfall during the winter season, unlike most other parts of India.
• Maharashtra: Located on the western side of India, Maharashtra receives the bulk of its rainfall from the Southwest Monsoon. The retreating monsoon has a very limited impact on this state.
• Punjab: Situated in the northwestern part of India, Punjab's rainfall is primarily influenced by the Western Disturbances during winter and the tail end of the Southwest Monsoon during summer. The retreating monsoon does not bring significant rainfall to Punjab.

Conclusion on Retreating Monsoon Rainfall

Based on the geographical location and the direction of the retreating monsoon winds, Tamil Nadu is the region that primarily receives rainfall from this phenomenon. The moisture picked up from the Bay of Bengal leads to the characteristic winter rainfall in the state.