Humidity is a measure of how much water is in the air relative to how much it can hold. Warm air can hold more water than cooler air, so as the air cools the capacity decreases even if the total amount of water in the air stays the same. Think of it like pouring water out of a big bucket into a smaller one – what might take up 50% of the big bucket would take up 100% of a bucket half its size.
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