Humidity, or the amount of water in the air can affect how it feels like. Water holds more heat energy, and so has a greater impact on how much you heat up or cool down.
Wind also affects how you feel. Notice that when you cool yourself with the fan, the fan is not actually cooling the air, it feels cooler because the speed heat is transferred to air is increased. This you can imagine as newer fresh air is bombarding ar your skin as opposed to air heated by your skin sort of stagnating around you.
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