Whats the difference between Dewpoint and Relative Humidity?
This is by far the most asked question. The dewpoint is the temperature at which water vapor will condense. You have to think of the dewpoint as an “absolute” measure of how much mositure is in the air. The higher the dewpoint, the more water that is present in the atmosphere. The relative humidity is an expression of how saturated the air is for a given temperature. Here’s the easiest way to remember it: When the temperature and dewpoint are equal, the “relative humidity” is 100%. The air cannot hold any more moisture, at that temperature! If the temperature and dewpoint are far apart, than the relative humidity is low, in other words, the air is relatively dry for the temperature. Here are some real world examples to help you: Temperature is 32 F. Dewpoint is 32 F. The air is saturated. The relative humidity is 100% Temperature is 50 F. Dewpoint is 32 F. The air is somewhat dry for the temperature. The relative humidity in this case is around 50% Temperature is 68 F. Dewpoint is 32 F
