Title: Climate of India
Content:  Most of Northeast India and much of North India are subject to a humid subtropical climate and a subtropical highland climate. Though they experience warm to hot summers, temperatures during the coldest months generally fall as low as 0 °C. Due to ample monsoon rains, India has two subtropical climate subtypes under the Köppen system: Cwa and Cwb. In most of this region, there is very little precipitation during the winter, owing to powerful anticyclonic and katabatic (downward-flowing) winds from Central Asia. Humid subtropical regions are subject to pronounced dry winters. Winter rainfall—and occasionally snowfall—is associated with large storm systems such as "Nor'westers" and "Western disturbances"; the latter are steered by westerlies towards the Himalayas. Most summer rainfall occurs during powerful thunderstorms associated with the southwest summer monsoon; occasional tropical cyclones also contribute. Annual rainfall ranges from less than 1000 mm in the west to over 2500 mm in parts of the northeast. As most of this region is far from the ocean, the wide temperature swings more characteristic of a continental climate predominate; the swings are wider than in those in tropical wet regions, ranging from 24 °C in north-central India to 27 °C in the east.
Title: North India
Content:  The region receives heavy rain in plains and light snow on Himalayas precipitation through two primary weather patterns: the Indian Monsoon and the Western Disturbances. The Monsoon carries moisture northwards from the Indian Ocean, occurs in late summer and is important to the Kharif or autumn harvest. Western Disturbances, on the other hand, are an extratropical weather phenomenon that carry moisture eastwards from the Mediterranean Sea, the Caspian Sea and the Atlantic Ocean. They primarily occur during the winter season and are critically important for the Rabi or spring harvest, which includes the main staple over much of North India, wheat. The states of Jammu and Kashmir, Himachal Pradesh and Uttarakhand receive some snowfall in winter months.
Title: Climate of India
Content:  for parts of Punjab and northern India. Despite the Himalayas being a barrier to the cold northerly winter winds, the Brahmaputra valley receives part of the frigid winds, thus lowering the temperature in Northeast India and Bangladesh. The Himalayas, which are often called "The Roof of the World", contain the greatest area of glaciers and permafrost outside of the poles. Ten of Asia's largest rivers flow from there. The two Himalayan states in the east, Sikkim and Arunachal Pradesh, receive substantial snowfall. The extreme north of West Bengal centred on Darjeeling experiences snowfall, but only rarely. In South India, particularly the hinterlands of Maharashtra, parts 
Title: Monsoon
Content:   Around September, with the sun retreating south, the northern landmass of the Indian subcontinent begins to cool off rapidly, and air pressure begins to build over northern India. The Indian Ocean and its surrounding atmosphere still hold their heat, causing cold wind to sweep down from the Himalayas and Indo-Gangetic Plain towards the vast spans of the Indian Ocean south of the Deccan peninsula. This is known as the Northeast Monsoon or Retreating Monsoon. While travelling towards the Indian Ocean, the cold dry wind picks up some moisture from the Bay of Bengal and pours it over peninsular India and parts of Sri Lanka. Cities like Chennai, which 
Title: 2011 North Indian cold wave
Content:  North Indian Cold Wave (2011) is the cold snap affected across northern parts of India in the winter of 2011, killing more than 130 people. Uttar Pradesh, Punjab and Haryana were the northern states badly hit by the cooling of the air.
Title: Climate of India
Content:  During the post-monsoon or autumn months of October to December, a different monsoon cycle, the northeast (or "retreating") monsoon, brings dry, cool, and dense air masses to large parts of India. Winds spill across the Himalayas and flow to the southwest across the country, resulting in clear, sunny skies. Though the India Meteorological Department (IMD) and other sources refers to this period as a fourth ("post-monsoon") season, other sources designate only three seasons. Depending on location, this period lasts from October to November, after the southwest monsoon has peaked. Less and less precipitation falls, and vegetation begins to dry out. In most parts of India, this period marks the transition from wet to dry seasonal conditions. Average daily maximum temperatures 
Title: Climate of India
Content:   Once the monsoons subside, average temperatures gradually fall across India. As the Sun's vertical rays move south of the equator, most of the country experiences moderately cool weather. December and January are the coldest months, with the lowest temperatures occurring in the Indian Himalayas. Temperatures are higher in the east and south. In northwestern India region, virtually cloudless conditions prevail in October and November, resulting in wide diurnal temperature swings; as in much of the Deccan Plateau, they register at 16–20 °C (29–36 °F). However, from January to February, "western disturbances" bring heavy bursts of rain and snow. These extra-tropical low-pressure systems originate in the eastern 
Title: 2017 North Indian cold wave
Content:  North India was devastated by a cold wave during the month of January 2017. This occurrence had a severe effect on several North Indian states, including Himachal Pradesh, Jammu and Kashmir, Punjab, Harayana, Rajasthan, and Uttar Pradesh. The lowest temperature in Gulmarg due to the cold wave was recorded at -12.4 C. The banks of Dal Lake in Srinagar froze. Keylong of Himachal Pradesh and Kargil of Jammu and Kashmir witnessed low temperatures of -13.9 C. Several army camps in Kashmir bound sectors were damaged and many people died in avalanches in Kashmir districts near the Line of Control during the last few days of January 2017.
Title: Climate of Delhi
Content:  Winter arrives in Delhi by early November. Minimum temperatures gradually enter single digits by this time of the year, while days are cool. Though usually not cold initially, December suddenly becomes cold in the latter half, as chilly north-western winds from the Himalayas begin sweeping the Northern Plains. These cold waves are caused by a depression created by Western Disturbance, which bring cloud cover and winter rains to the Plains, and add to snowfall in the North-Western Indian Subcontinent. By early January, when winter peaks in Delhi, the minimum temperatures plunge to the vicinity of 0 C, though very rarely entering the negative scale. Maximum temperatures, too may drop down into single digits and always stay under 15 
Title: North India
Content:  Northern Indian tradition recognises six distinct seasons in the region: summer (grishma or garmi, May–June), rainy (varsha, July–August), cool (sharad, September–October, sometimes thought of as 'early autumn'), autumn (hemant, November–December, also called patjhar, lit. leaf-fall), winter (shishir or sardi, January–February) and spring (vasant, March–April). The literature, poetry and folklore of the region uses references to these six seasons quite extensively and has done so since ancient times when Sanskrit was prevalent. In the mountainous areas, sometimes the winter is further divided into "big winter" (e.g. Kashmiri chillai kalaan) and "little winter" (chillai khurd).

Question: the cold dry winds that blow over northern india in winter are called?
Answer: Northeast Monsoon.
Retreating Monsoon.
Northeast Monsoon or Retreating Monsoon.