What causes rainfall during winters in the North-Western part of India?
a: Western cyclonic disturbances
b: Retreating Monsoon
c: Northeast trade winds
d: Southwest Monsoon

Hint: The normal precipitation in India is 125 cm. The South-west monsoon comprised 75% of the complete precipitation (June to September), 13% of it is comprised by north-east storm (October to December), 10% of it by pre-monsoon cyclonic precipitation (principally in April and May and 2% of it by western disturbances (December to February).

Complete Answer: Western aggravations or disturbances cause precipitation during winter in the northwestern part of India. This is an example which is driven by Westerlies. With the moving toward winter, the least temperatures in the places have descended throughout because of the appearance of northwesterly breezes called Western Disturbances. A western disturbance is an extratropical storm which starts in the region of the Mediterranean that brings winter rain which is unexpected toward the northwestern parts of the Indian subcontinent.
It is non-monsoonal precipitation that is driven by the westerlies. The moisture present in these tempests or storms ordinarily begins over the Mediterranean Sea, the Caspian Sea and the Black Sea. Extratropical storms are worldwide marvels with moisture generally conveyed in the upper part of the atmosphere, dissimilar to their tropical counterparts where the moisture is conveyed in the lower climate. On account of the Indian subcontinent, moisture is now and again shed as rain when the storm encounters the Himalayas. Western disturbances are more continuous and strong in the colder time of year season.

Note: India's northwestern corner includes the region of Kashmir and the incomparable Himalaya range, the states like Haryana, Himachal Pradesh, Punjab, Rajasthan, Uttarakhand, Uttar Pradesh, and the National Capital Territory Delhi.