The "Winter Line" refers to a meteorological phenomenon that occurs in the Himalayas during winter months. It is characterized by a distinct line where the warm air from the plains meets the cold air from the mountains, creating a visible boundary. This line often results in a dramatic change in weather conditions, leading to clear skies in the lower regions while the mountains may be shrouded in clouds or fog. This phenomenon is particularly noticeable in areas like Mussoorie and Dehradun in India, where the contrast between the warm valleys and the cold peaks creates stunning views. The Winter Line can also influence local climate patterns, affecting agriculture and tourism in these regions.