Explanation: Relative Humidity (RH) is a critical factor in predicting rainfall. It measures the amount of water vapor in the air relative to the maximum amount the air can hold at a given temperature. When the air is saturated with water vapor, the RH is 100%, and this condition often leads to precipitation.
In the context of Maharashtra, the coastal regions, particularly Mumbai, are more prone to high RH levels due to their proximity to the Arabian Sea. The Arabian Sea monsoon plays a significant role in the weather patterns of these areas, bringing in moist air that increases the RH. When the RH is high, as in the case of Mumbai with 85%, the air is close to its saturation point, making it more likely for the water vapor to condense into liquid form, leading to rainfall.
Delhi, being located in the northern part of India, has a more arid climate with lower RH levels, typically around 50%. This lower RH indicates that the air is not as saturated with water vapor, reducing the likelihood of rainfall. Chennai, located on the eastern coast, also experiences high RH levels, but not as high as Mumbai's. The influence of the Bay of Bengal and the monsoon can bring significant rainfall to Chennai, but the RH of 70% is not as indicative of immediate rainfall as the 85% RH in Mumbai.
Nagpur, situated in the central part of Maharashtra, has a RH of 60%, which is moderate. While this RH level can contribute to the possibility of rainfall, it is not as high as the RH in Mumbai. The climate in Nagpur is more influenced by the central Indian plateau, which generally experiences less rainfall compared to coastal areas.
In summary, the high RH of 85% in Mumbai makes it the most likely place to experience rainfall among the given options. The coastal location and the influence of the Arabian Sea monsoon contribute to the high RH levels, which are a strong indicator of the likelihood of rainfall.