Indian Climate and the Monsoon

Indian climate and monsoon for UPSC: monsoon mechanism, jet streams, El Niño and IOD, the four seasons, local winds, rainfall distribution and climatic regions.

SyllabusGS I · Salient features of world's physical geography; physical geography of India — climate, monsoon and important geophysical phenomena

The monsoon is the single most important fact of Indian geography. It decides the kharif harvest, rural incomes, reservoir levels, food inflation and hydropower — which is why each year’s forecast makes national news.

What UPSC asks

Prelims: the mechanism (ITCZ, jet streams, Tibetan heating), El Niño, La Niña and the Indian Ocean Dipole, local winds (mango showers, Kalbaisakhi, loo), western disturbances, why Tamil Nadu gets its rain in winter, and rain-shadow regions.
Mains (GS I and GS III): theories of the monsoon, its variability and impact on agriculture and the economy, extreme weather and climate change.

Key sub-topics

Sub-topic	Core idea
Factors of Indian climate	Latitude, Himalayas, land–sea distribution, relief, upper-air circulation
Monsoon mechanism	Differential heating, ITCZ shift, jet streams, Mascarene High
Teleconnections	ENSO and IOD
Seasons	Cold weather, hot weather, south-west monsoon, retreating monsoon
Local winds and storms	Mango showers, blossom showers, Kalbaisakhi, loo
Rainfall and climatic regions	Distribution, variability, Köppen regions of India

Start with the core page on the mechanism of the Indian monsoon, then use the quick revision sheet and the practice questions.