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RE: Help me understand Dew Point, I just don't get it. . .
It's a measure of actual air moisture, unlike relative humidity, which is a function of temperature. For every 18-degree Fahrenheit rise in temperature, the air can hold twice as much moisture. So 90% relative humidity at 70 degrees translates to the same amount of air moisture as 45% RH at 88 degrees.

The dew point is a much better index of human misery. It's the temperature at which water can no longer evaporate into the air and thus condenses. 70 is nasty. 75, and you might as well not even do more than jog.

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