Generally they’re measuring by two different techniques. First is dry bulb. That’s what the temperature is, with no regard to other factors.
The second is wet bulb. This takes into account humidity and wind chill.
Both of these are important because in high temperatures, a high humidity doesn’t allow sweat to work as well. So it will feel hotter than it is.
Conversely on the other end, if there’s wind, it will blow away any warmth on the surface of your skin, making sure you feel every bit of the cold.
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