In summer, the relative humidity remains higher throughout the country and exhibits a different pattern compared to winter. The air contains higher percentage of water vapour during monsoon. But this pattern goes on decreasing towards the west. Thus, eastern region becomes more humid compared to the western. The monsoon wind contains higher amount of water molecules. The temperature of a volume of air decreases and its capacity to hold moisture also decreases and thus relative humidity increases. As we go towards west, water molecules in air decrease, moisture absorbing capacity of air increases and relative humidity decreases.
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