What is the relationship between current temperature, relative humidity, and dew point?
The warmer air is, the more water vapor it can “hold.” Dew point is a measure of how much water vapor is actually in the air. Relative humidity is a measure of the amount of water in the air compared with the amount of water the air can hold at the temperature it happens to be when you measure it. To see how this works, let’s use the chart below, which is adapted from a good introductory college meteorology textbook, Meteorology Today by C. Donald Ahrens, published by West Publishing.
