Which one of the following is the characteristics of the cold-weather season in North India?
A. Cool days and cold night
B. Warm days and cold nights
C. Cold days and cool nights
D. Cool nights and warm days

Hint: The cold weather season is referred to as the winter season. North India experiences very drastic changes in its temperatures during this season. They usually begin mid-November in this region and end by late February.

Complete answer:
Cool days and cold nights: Some regions of Northern India, especially the ones located in high altitude regions might experience cool days and cold nights. The coldest region in India is situated in the Drass valley, where temperatures drop as low as -22degree C.
Warm days and cold nights: Generally, in Northern India, the cold season is characterized by warm days and cold nights. The morning time is pleasant, while the result of the decrease in the temperatures leads to frost in some areas. The cyclonic disturbances also create a situation of rainfall in North India and snowfall in the high altitude Himalaya regions, which is very beneficial for the Rabi crops.
Cool days and cold nights: In high altitude regions, this kind of weather might prevail. These areas receive less sunlight which makes the days severely cold. It is very dry since the northeast trade winds travel from land to sea. The option is the same as the first one.
Cool nights and warm days: The option is the same as the second option.
So, the correct answer is Option B.

Note: December and January are the chilly months of the cold weather season. It is important to note that Northern India covers a vast region so some difference in its cold weather over the regions is bound to exist. Thus, a generally accepted warm day and cold night are used to describe the cold weather in North India.