So humidity is the measure of how much water can be suspended in air. At 100% the air is full and it rains or condensates on everything.
The amount of water the air can hold is dictated by the temperature. Warm air holds more and cold air holds less.
So if you have 50% humidity at 90 degrees you could have double the water in the air before it rains.
If the temperature drops that doesn’t mean the water has to leave so at 60 degrees you may be only able to hold 70% of what you could at 90.
That would mean the humidity would raise to ~72%>
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