State reasons :
(i) North-western India receives rainfall in winter also.
(ii) A high pressure centre develops over northwestern India in winter.
(iii) During the southwest monsoon season, winds in Ganga valley generally blow from east to west.
(iv) The annual range of temperature is more in Delhi than in Mumbai.
(i) North-western India receives rainfall in winter also.
Reasons: The north-western plains of India experience winter rainfall due to the invasion of the western disturbances rising from the Mediterranean sea, steered by the westerly jetstream. As the western disturbances are associated with the cyclonic winds, they bring rainfall.
(ii) A high-pressure centre develops over northwestern India in winter.
Reasons: In winter the sun shines vertically over the Tropic of Capricorn and the north western part of India away from marine influence experiences low temperature and high atmospheric pressure. The minimum temperature is much below than 10° to 12°C. So a high pressure centre develops over this part of the country.
(iii) During the southwest monsoon season, winds in Ganga valley generally blow from east to west.
Reasons: The Bay of Bengal current splits into two branches—one advances towards North-Eastern India, Myanmar, Thailand and the other crossing the Bay of Bengal directed westward into the monsoon trough of low pressure. The wind in Ganga plain therefore blows from the east to west and the rainfall decreases westward.
(iv) The annual range of temperature is more in Delhi than in Mumbai.
Reasons: The distribution of temperature is determined by some factors. The places located far inland have a greater range of temperature than those located near the sea. Delhi is located far away of sea therefore it has more annual range of temperature than that of Mumbai as Mumbai is located near the sea.
