Climate and the Indian monsoon system

India has a tropical monsoon climate in broad terms, but that label hides strong regional contrasts. India lies in the Northern Hemisphere; the mainland extends roughly from 8°4'N to 37°6'N, and the Tropic of Cancer passes through the central part of the country. This location puts south India closer to the tropical-maritime influence, while north and north-west India show sharper seasonal contrasts of summer, winter and rainfall. The Himalaya blocks much cold continental air from Central Asia, the Indian Ocean supplies moisture on three sides, and the north-western landmass heats sharply before the rains. Latitude, altitude, distance from the sea, relief and pressure belts together create India's climatic pattern. A CET answer should therefore read climate as a system, not as a list of isolated places.

The main annual rhythm has four familiar phases: cold weather season, hot weather season, advancing southwest monsoon and retreating monsoon. The cold season is clearer and drier in most of India, except where western disturbances bring rain or snow. The hot season builds the thermal low over north-west India and Pakistan. The southwest monsoon then reverses the wind direction and brings maritime moisture inland. After September, withdrawal and wind reversal create a distinct retreating phase.

The most useful frame is unity with diversity: monsoon winds link the country, but rainfall varies from desert Rajasthan to the wet Meghalaya hills and from the Malabar coast to the Coromandel coast. Mumbai, Kochi and Chennai show stronger maritime moderation than inland cities such as Delhi, Jaipur and Nagpur; the Western Ghats, Meghalaya hills and Aravalli alignment also reshape rainfall distribution.

Core idea: Indian climate is monsoonal at the national scale, but local outcomes depend on latitude, relief, distance from sea and seasonal circulation.