Not sure what you mean – that’s not really familiar to me at all. The one scenario I can imagine is the following: you’re outside, where it’s very cold, but lightly cloudy or even sunny. You go inside into an unheated building. The air temperature will be the same as outside, yes. But outside, you were getting hit by the rays of the sun, which carry energy and warm you. Inside, you are not, or less so, so you feel colder. You’re basically stepping into the shade, which works no matter what the temperature is.
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