Describe winter season in India under …

In winter months, the weather conditions over India are generally influenced by the distribution of pressure in the Central and Western Asia. A high-pressure centre in the region lying to the north of the Himalayas develops during winter. This centre of high pressure gives rise to the flow of air from the north towards the Indian subcontinent, south of the mountain range. These surface winds blowing out of the high-pressure centre over Central Asia reach India in the form of a dry continental air mass. These continental winds come in contact with trade winds over northwestern India. The position of this contact zone is not, however, stable. Occasionally, it may shift its position as far east as the middle Ganga valley with the result that the whole of the northwestern and northern India up to the middle Ganga valley comes under the influence of dry northwestern winds.