What you’re referring to is called ‘wind chill’ and ‘heat index’.
Wind chill is how cold it feels when the wind is stripping even more heat from your body by blowing it off you, making it feel colder than what the thermometer says.
Heat index is how hot it feels when humidity inhibits evaporation from sweat to cool you down, which can make it feel hotter than what the thermometer says.
People are generally more interested in what the temperature feels like vs what the temperature actually is.
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