Introduction:
India has a diverse climate due to its vast geographical area and different topography. The monsoon season is an essential period for India's agriculture, which is the main source of livelihood for millions of people. Southwest monsoon is the primary source of rainfall in India.

Climate of India:
India's climate is affected by various factors such as latitude, altitude, distance from the sea, and topography. The Himalayas act as a barrier to the cold winds from Central Asia, while the Thar Desert in Rajasthan experiences extreme heat during summers. The monsoon winds are the most significant factor that influences India's climate.

Southwest Monsoon:
The southwest monsoon is a seasonal wind that blows from the Arabian Sea and the Bay of Bengal towards the Indian subcontinent. It hits the Kerala coast in June and covers the entire country by July. It is the primary source of rainfall in India, contributing around 70% of the country's total rainfall.

Reason for Maximum Rainfall:
The southwest monsoon brings maximum rainfall in India due to the following reasons:

- Topography: India's topography, such as the Himalayas, Western Ghats, and Eastern Ghats, plays a crucial role in attracting the monsoon winds. The mountains act as barriers and force the moist winds to rise, leading to the formation of clouds and rainfall.

- Low-Pressure System: The monsoon winds create a low-pressure system over the Indian subcontinent, which attracts more moisture-laden winds from the Indian Ocean. This results in heavy rainfall in India.

- Inter-Tropical Convergence Zone (ITCZ): The ITCZ is a zone where the trade winds from the northern and southern hemispheres converge. During summers, the ITCZ shifts towards the north, bringing the southwest monsoon winds towards India.

Conclusion:
In conclusion, the southwest monsoon is the primary source of rainfall in India, contributing around 70% of the country's total rainfall. India's topography, low-pressure system, and the Inter-Tropical Convergence Zone (ITCZ) are the significant factors that influence the southwest monsoon and bring maximum rainfall in India.

Because it is near the sea so sea from land it blows fast.