“Feels like” takes into account how fast your body would lose or gain heat. So if it’s 40 outside, but there’s a wind, it might ‘feel’ like 30 degrees. That doesn’t mean that water would freeze, it just means that you would lose heat from your body as fast as you would on a 30 degree day with no wind.
Humidity will also affect this. Cold, humid air will rob you of heat faster. Hot, humid air will keep your body from being able to shed heat (by sweat evaporating) as quickly.
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