Explanation: India's geographical diversity is reflected in its varied climatic conditions, with rainfall patterns differing significantly across the country. The amount of rainfall in a region is influenced by several factors, including the monsoon winds, topography, and distance from the sea.
The monsoon winds are a significant factor in determining rainfall distribution. The southwest monsoon, which typically arrives in June and lasts until September, brings heavy rainfall to the western coast and the northeastern parts of India. In contrast, the eastern coast and the central parts of the country receive less rainfall due to the influence of the northeast monsoon, which is less predictable and less intense.
Topography also plays a crucial role in determining rainfall patterns. The Western Ghats, a mountain range along the western coast, acts as a barrier, causing heavy rainfall on the windward side and creating a rain shadow effect on the leeward side. Similarly, the Himalayas in the north block the cold winds from Central Asia, leading to heavy rainfall in the northeastern states.
Rajasthan and Punjab are two regions that experience scanty rainfall. Rajasthan, located in the northwestern part of India, is a vast desert region with very little rainfall, especially in the western and central parts. The Thar Desert, which covers a significant portion of Rajasthan, is one of the driest regions in India. The average annual rainfall in Rajasthan is around 200-500 mm, which is much lower than the national average.
Punjab, located in the northwestern part of India, also experiences less rainfall compared to other parts of the country. While it receives more rainfall than Rajasthan, it still falls into the category of regions with scanty rainfall. The average annual rainfall in Punjab is around 450-700 mm, which is lower than the national average of about 1170 mm.
In contrast, regions like Kerala and Karnataka, located on the western coast, receive heavy rainfall due to the influence of the southwest monsoon. Mumbai, a coastal city, also receives significant rainfall during the monsoon season. Hyderabad, located in the Deccan Plateau, receives moderate rainfall.
Understanding the geographical and climatic factors that influence rainfall patterns is essential for comprehending the diverse climatic conditions in India. This knowledge is crucial for various fields, including agriculture, water resource management, and disaster preparedness.