In India, maximum amount of rainfall is received from
South-west Monsoon
Understanding India's Rainfall Sources and the South-west Monsoon
India receives rainfall from several atmospheric systems throughout the year. Understanding these systems is key to identifying which one contributes the maximum amount of precipitation.
Key Rainfall Sources in India
The major sources of rainfall in India are:
- South-west Monsoon: This is the primary monsoon season in India, occurring from June to September. Winds blow from the south-west towards the Indian subcontinent, carrying vast amounts of moisture from the Arabian Sea and the Bay of Bengal.
- North-east Monsoon: Also known as the winter monsoon, this occurs during October to December. Winds blow from the north-east across the mainland. While it brings significant rainfall to certain regions, particularly the southeastern coastal areas like Tamil Nadu, its overall contribution to the country's total rainfall is less than the South-west Monsoon.
- Western Disturbances: These are extratropical storms originating in the Mediterranean region that travel eastward and bring sudden winter rain to the northern parts of the Indian subcontinent, including Punjab, Haryana, Uttarakhand, and Jammu & Kashmir. Their contribution is mainly limited to the winter season and the northern regions.
- Retreating Monsoon: This refers to the period from September to December when the South-west Monsoon winds start withdrawing from the Indian subcontinent. The withdrawal itself doesn't bring much rain, but the conditions during this transition period, often associated with cyclonic activity in the Bay of Bengal, can bring heavy rainfall to coastal areas. This phase overlaps with the beginning of the North-east Monsoon in the south.
Contribution Analysis
Let's compare the contribution of these systems:
| Rainfall Source | Typical Period | Regions Primarily Affected | Contribution to Total Rainfall |
|---|---|---|---|
| South-west Monsoon | June - September | Most of India | Highest (around 75%) |
| North-east Monsoon | October - December | Tamil Nadu, South Andhra Pradesh, Kerala, South Interior Karnataka | Significant for specific regions, but less than SW Monsoon nationally |
| Western Disturbances | December - February | Northern India (especially hills and plains) | Limited, mainly winter precipitation |
| Retreating Monsoon | September - December (transition) | East coast, South India (often associated with cyclones) | Variable, less than SW Monsoon nationally |
The South-west Monsoon is a crucial period for Indian agriculture and economy because it accounts for approximately 75% of the country's total annual rainfall. It covers almost the entire country over its four-month duration.
While other systems like the North-east Monsoon and Western Disturbances are important for specific regions and seasons, their cumulative contribution to the total rainfall received across India is significantly less compared to the South-west Monsoon.
Therefore, the maximum amount of rainfall in India is received from the South-west Monsoon.
Revision Table: India Rainfall Sources
| Source | Peak Season | Major Impact |
|---|---|---|
| South-west Monsoon | Summer/Monsoon (June-Sept) | Most of India, main agricultural season rain |
| North-east Monsoon | Post-Monsoon/Winter (Oct-Dec) | South-eastern coast (e.g., Tamil Nadu) |
| Western Disturbances | Winter (Dec-Feb) | Northern India, winter rain/snow |
| Retreating Monsoon | Autumn (Sept-Dec) | Transition period, often cyclonic activity in coastal areas |
Additional Information on Indian Monsoons
The Indian monsoon system is a complex weather phenomenon driven by the differential heating of land and sea. The South-west Monsoon is caused by the large-scale movement of moisture-laden winds from the ocean towards the land due to the formation of a low-pressure area over the heated landmass of India during summer. The North-east Monsoon, on the other hand, is associated with the cooling of the landmass and the development of high pressure, causing winds to blow from land towards the sea.
Factors like the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) can influence the strength and distribution of monsoon rainfall in India.
Important Questions from Indian Climate
According to Koppen's climatic classifications, the Great Northern Plains of India have which one of the following climates?
According to the Indian Meteorological Department, which of the following is/are the feature/features of cloudburst?
1. Heavy precipitation in short period of time in a limited geographical area
2. It occurs generally during monsoon period and triggers flash flood and landslides
Select the correct answer using the code given below.Which of the following are correct with regard to Indian Monsoonal Rainfall?
1. Largely governed by the topographical features
2. Regional and seasonal variation in the distribution of rainfall
3. Heavy downpour resulting in considerable runoff
4. Beginning and end of rain is regular and on time
Select the correct answer using the code given below:Match List I with List II and select the correct answer using the code given below the Lists:
List I ( Type of climate )
List II ( State )
A. Monsoon with Short Dry Season (Amw)
1. Uttar Pradesh and Bihar
B. Cold Humid Winter with Short Summer (Dfc)
2. Tamil Nadu Coast
C. Monsoon with Dry Winter (Cwg)
3. Arunachal Pradesh
D. Monsoon with Dry Summer (As)
4. Kerala and Karnataka Coast
Which of the following is correctly matched?
