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rAnnual rainfall of over 300 cm is received over parts of western coast and northeastern India. Annual rainfall of less than 50 cm is experienced in western Rajasthan and adjoining parts of Gujarat, Haryana and Punjab. Rainfall is equally low in the interior of the Deccan plateau east of the Sahyadris. A third area of low precipitation is around Leh in Kashmir. Rest of the country receives a moderate rainfall. Snowfall is restricted to the Himalayan region.
For average rain fall in different states, please check the following link:
http://www.rainwaterharvesting.org/Urban/Rainfall.htm |

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In recent years, the Cherrapunji-Mawsynram region has averaged 9,296 millimetres (366 in) of rain annually, though Cherrapunji has had at least one period of daily rainfall that lasted almost two years. India's highest recorded one-day rainfall total occurred on 26 July 2005, when Mumbai received more than 650 millimetres (26 in); the massive flooding that resulted killed over 900 people.
Floods are the most common natural disaster in India. The heavy southwest monsoon rains cause the Brahmaputra and other rivers to distend their banks, often flooding surrounding areas. Though they provide rice paddy farmers with a largely dependable source of natural irrigation and fertilisation, the floods can kill thousands and displace millions. Excess, erratic, or untimely monsoon rainfall may also wash away or otherwise ruin crops. Almost all of India is flood-prone, and extreme precipitation events, such as flash floods and torrential rains, have become increasingly common in central India over the past several decades, coinciding with rising temperatures. Mean annual precipitation totals have remained steady due to the declining frequency of weather systems that generate moderate amounts of rain |