The correct answer is Western disturbances.
Key Points
- Western Disturbances are responsible for the rainfall during winter over the northwestern part of India.
- The Western Disturbance originates in the mid-latitude region near Europe and the Atlantic Ocean.
- The low pressure builds up over the Mediterranean Sea and moves over Iraq, Afghanistan, and Pakistan before entering India, and contains substantial amounts of moisture.
- When these low-pressure systems reach the Indian subcontinent, they are blocked by the Himalayas and rain as snow over the northwestern plains and the higher reaches of the western Himalayas.
- After precipitation over northwest India, they weaken and are devoid of moisture, they blow as dry winds that form dense fog over the northern plains of India.
Additional Information
- The period June to September is referred to as the Southwest Monsoon period.
- Southwest Monsoon period is the principal rainy season for the Indian subcontinent.
- This is the summer monsoon period where the southwest monsoon holds away over the country.
- The whole country receives nearly 75% of its rainfall during this period.




