Wind-chill is a strictly fake number designed to represent how cold the air feels because the wind is blowing. It’s not actually colder, but wind moving air, especially wet air, will “feel” cold because it rips the heat from your body faster than just the standing air would. It’s really no different than how you might have noticed 70 degree(F) air is comfortable/warm but 70 degree water can feel downright cold, it’s just that one is better at ripping the heat off of you.
So in that sense, wind-chill just means any thermometer subject to moving airflow will be more accurate faster, but would likely feel colder(or warmer) to human skin because human skin doesn’t really feel temperature but instead how fast it gains or loses heat.
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