We’ve recently received several reader requests asking us how to calculate relative humidity if the temperature and dew point are known. Relative humidity is the ratio (expressed as a percent… ...

The relative humidity, in short, measures the amount of water vapor in the air compared to the air temperature. So what’s the problem with that in terms of figuring out how muggy it might be ...

Most people understand relative humidity, but the dew point is a much better measure of how humid it really feels.

Dew point Because relative humidity isn’t a good descriptor for how you will feel, years ago, meteorologists starting using the dew point to better explain how much water is actually in the air.

So, what is the difference, if there really is one? To find out, let’s dive into what dewpoint is and what relative humidity is. Dewpoint is a more direct measure of moisture in the air.

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