That’s because cold air cannot hold as much moisture as warm air. For example, if the dew point is 25 and the air temperature is 25, does it feel humid? No, even though the relative humidity would be 100% at that time. When thinking about being outside or in weather, it is also a better measure of how humid it feels. In addition, the higher the dew point, the more humid it will feel outside. Dew point is a better measure of absolute measure of the water vapor in the air within a given air mass. The WBT will vary with Relative Humidity (RH). That would make the relative humidity 100% because both temperatures are the same. When moisture evaporates, it cools the environment, reducing the temperature slightly. Let’s say the dew point is 72 and the air temperature is 72. Sounds complicated, I know but stay with me. However, the dew point is the temperature at which the air will have a relative humidity of 100%. The dew point is measured as a temperature, while the relative humidity is expressed as a percentage. The relative humidity is the ratio of the amount of moisture actually in the air to the maximum about that can be present at that temperature. Dew points compared to relative humidity can be confusing, but they actually are two different things. The two maps below show the 1) average annual relative humidity and 2) the. This is a truer reflection of the moisture regime. You ever wonder why meteorologists always talk about dew points instead of the relative humidity? It’s easy! Dew points express the true amount of moisture in the air which correlates to how sticky or humid it feels outside. The average dew point in Alaska is the lowest of all 50 states. Dew point is a more accurate measure of how much moisture is in the air. When relative humidity reaches 100, it means dew point has been reached.
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