UPSC foundations · Note 052
The Four Seasons of India
Study context: GS I — Distribution of key natural resources across the world (including South Asia and the Indian subcontinent); important geophysical phenomena.
The India Meteorological Department divides India's year into four seasons: winter (December to February), summer or the hot weather season (March to May), the south-west monsoon or rainy season (June to September), and the post-monsoon or retreating monsoon season (October to November). This is a useful framework, but it is an average: the north experiences sharp seasonal contrasts, while the far south, close to the equator, has much smaller temperature changes, and the Himalayas have their own mountain climate at every season.
Winter is cool and dry over most of India, with cold conditions in the north, where temperatures can fall sharply, and pleasant conditions in the south. Western disturbances, low-pressure systems travelling from the Mediterranean region, bring light rain and occasional snow to the north-west, which is valuable for winter wheat and for replenishing Himalayan snow. Summer brings rising heat, with the highest temperatures usually in May in the interior, hot dry winds called loo in the north, and pre-monsoon thunderstorms, known in Kerala and Karnataka as mango showers because they help mango ripening, and in West Bengal and Assam as nor'westers or Kalbaisakhi.
The monsoon season transforms the country, cooling temperatures and filling rivers, tanks and reservoirs, though the cooling is uneven and humidity rises sharply. The retreating monsoon season, from October to November, is a transition: the south-west monsoon withdraws from the north-west first and gradually from the rest of the country, while winds reverse to blow from land to sea. The north-east monsoon, which is part of this season, brings important rain to Tamil Nadu and parts of the south-east coast, which depend on it far more than on the south-west monsoon.
For civil studies, the seasonal calendar is also an administrative calendar. Sowing and harvesting, school terms, road construction, disease patterns and disaster preparedness all follow it. Cyclones are most frequent in the Bay of Bengal around the post-monsoon season, heatwaves peak before the monsoon, and cold waves affect the north in winter. Planning that ignores the season, whether for elections, relief stocks or vaccination drives, usually pays for the mistake. The seasons therefore belong in answers on agriculture, health, transport and disaster management, not only in climate chapters.
Key takeaways
- The India Meteorological Department recognises four seasons: winter (December–February), summer (March–May), south-west monsoon (June–September) and retreating monsoon (October–November).
- Winter rain in the north-west comes largely from western disturbances; Tamil Nadu depends heavily on the north-east monsoon in October–November.
- Heatwaves, cyclones and cold waves each peak in particular seasons, so public planning must follow the seasonal calendar.
Why it matters for civil studies
Seasonal timing shapes farming, health, transport and disaster risk, making the calendar a practical policy tool.
Think it through
Should public programmes be formally planned around the seasonal calendar, or does that make administration too rigid?
From the Public Notes companion study collection. Editorial context and corrections.