You can go outside on two different 90° days and it will feel drastically different. 90° with 10% relative humidity will actually *feel* like 85° outside; whereas 90° with 65% relative humidity will feel like 103°.
The amount of water present in the air around you determines how efficiently your body can regulate body temperature through sweat evaporation. If there is more humidity, our bodies are less able to lower our temperature by sweating and the heat bothers us more.
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