The distribution of rainfall in India is not even. It varies from season to season as well from place two place. Two factors have great influence in the distribution of rainfall. They are direction of monsoonal winds and relief features.
However, rainfall in India can be divided into four parts on the basis of areas:
1. Areas of Heavy Rainfall: The areas of heavy rainfall receive more than 200 ems rainfall. Due to heavy rainfall the tropical evergreen forests are found. These areas are Assam, Meghalaya, Arunachal Pradesh, Tripura, Nagaland, Mizoram, West Bengal, Bihar, Jharkhand, Uttar Pradesh, West Coast plains and Western slopes of Western Ghat.
2. Areas of Moderate Rainfall: These areas which receive rainfall between 100 to 200 cm and have monsoon forests. These areas are north-eastern slopes of Western Ghat, South-West Bengal, Chhattisgarh, Jharkhand, Odisha, South-Eastern Uttar Pradesh, Tarai area of the Himalayas, Eastern Tamil Nadu, etc.
3. Areas of Scanty Rainfall: These areas are Southern Peninsula, Madhya Pradesh, Eastern Rajasthan, Punjab, Haryana, Southern Uttar Pradesh, North and South Andhra Pradesh, Middle East Maharashtra, etc. These areas receive rainfall between 50 to 100 cm.
4. Areas of Inadequate Rainfall: Here rainfall is less than 50 cm. These areas are Rayalseema area of Andhra Pradesh, Kuchchh, Western Rajasthan, Western Punjab, etc.