What is the Monsoon? (Sea and Land Breeze on a Global Scale)

To understand the monsoon, you first need to understand the simple concept of Sea and Land breeze:

• Land heats up and cools down much faster than water.
• When land heats up, the air above it becomes hot, lighter, and rises. This creates an area of Low Pressure.
• Winds always flow from High-Pressure areas to Low-Pressure areas.

The word 'Monsoon' comes from the Arabic word Mausim, which means 'season'. The monsoon is essentially a massive, seasonal shifting of winds.

During Summer (The South-West Monsoon): In May and June, the giant landmass of Northern India heats up intensely under the sun, creating a massive Low-Pressure zone. Meanwhile, the Indian Ocean remains relatively cooler (High Pressure). Therefore, moisture-laden winds rush from the Indian Ocean towards the Indian landmass. These winds bring heavy, life-giving rainfall to the entire country.

During Winter (The North-East Monsoon): In winter, the process reverses. The land cools down much faster than the ocean. Now, the land is High Pressure and the ocean is Low Pressure. Dry winds blow from the land back toward the sea, leaving most of India dry (except for parts of Tamil Nadu, which get rain from these retreating winds).