Brown fat. When it’s cold out for the season your body stores a special fat that releases heat. When it’s hot out consistently then your body doesn’t hold onto as much brown fat.
It’s why people traveling to a new climate will feel too hot or too cold.
In northern climates I heard a saying sweat into summer and shiver into winter. You wear your jacket through spring so you trick your body into staying cool. You wait as long as you can to start insulating in the winter to trick your body into keeping you warm.
It’s also why babies need an extra layer of clothes. They don’t have these special fats. Children have a lot. It’s why you see kids and shove teens running around in shorts in the fall. It’s also why older people are always cold.
There’s a video I saw on YouTube about this but I don’t remember the channel.
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