Typically, there is more moisture in the air in the summer, because warmer air holds more water. When air holds more water, it holds more energy and transfers that energy more easily. This means that when the air is warm, it will transfer more energy to you. It also prevents your sweating from working as well, because your sweat cools you down by evaporating, but if it’s humid it won’t evaporate as well.
This is why people always joke, in arid areas, that “yeah it’s hot, but it’s a dry heat!”. When air is more humid, it feels hotter.
This actually works in reverse too. When it’s cold, humid air will pull more energy out of you. So on humid days (like after a rain or snow) it will feel colder than drier days.
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