The primary wet season is the , which accounts for approximately 75% to 80% of India’s total annual rainfall .
| Phase | Timeframe | Geographic Activity | Key Feature | | :--- | :--- | :--- | :--- | | | June 1 (±7 days) | Kerala coast | Explosive thunderstorm "break" | | Advance | June 10–15 | Mumbai, Kolkata, NE states | "Monsoon trough" establishes | | Coverage | June 30 – July 15 | Delhi, Rajasthan, rest of NW | Last region to get rain | | Peak | July – August | Pan-India | 80% of total rainfall occurs here | | Withdrawal | Sept 15 – Oct 15 | From NW to South | Ends with retreat from Tamil Nadu | wet season in india
From Kerala, the monsoon splits into two branches—the Arabian Sea branch (hitting the Western Ghats) and the Bay of Bengal branch (moving toward Northeast India and the Himalayas). By mid-July, the entire country is usually covered. The primary wet season is the , which
Unlike frontal rainfall (common in Europe/US), India’s wet season is a reversal of winds caused by intense thermal heating of the Tibetan Plateau and the Thar Desert. Unlike frontal rainfall (common in Europe/US), India’s wet