Dew point represents the air’s ability to retain water. Basically it’s humidity. It’s the temperature at which water will start to form dew on surfaces because the air won’t be able to hold any more moisture.
If you have a dewpoint of 78, that means that there is 100 % humidity up to 78 degrees. (25.5 Celsius) that’s going to be an extremely hot and incredibly muggy and humid air to operate in.
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