In this scenario relative humidity is high and it would tend to feel damp and clammy, but not so much muggy or tropical.īoth measurements are useful, but as a general guide on and warm or hot day it’s the dew point temp that will be a more reliable guide for determining comfort level. We’ve also had days where the dew point is around 70 along with a similar air temp and it’s been raining. You tend to get at least patchy fog and dewy grass galore. Now, a dew point in the 50s at night with temps in the 50s will feel damp with high relative humidity in this scenario. Relative Humidity Relative humidity is familiar to most of us because of its everyday usage with regard to the weather. Dews above 65 are downright muggy and even tropical when they reach the 70s. Relative humidity, specific humidity, humidity ratio, dew point, percent by volume, and grams per cubic meter are all used to express a measure of the amount of water vapor that is mixed with other gases. The general rule of thumb is that dew points in the 50s or lower is comfortable during the warm months. The farther apart they are the lower the relative humidity. We can see from these examples that the closer the temp is to the dew point, the higher the relative humidity. In fact, the heat index temperature – what it actually feels like outside – would be 98 degrees! In this scenario, it would feel quite humid or muggy and even uncomfortable despite the relative humidity being fairly low. Hold that dew point at 65 with the air temp rising to 95. What is dew point Dew point is the temperature to which air must be cooled in order to produce condensation (dew). Relative humidity is the amount of water in the air, relative to full saturation of the air. The Dew Point temperature is always lower than the Dry Bulb temperature and will be identical with 100 relative humidity (the air is at the saturation line). Relative humidity in this situation is 100%. Temperature and relative humidity are two factors used to determine the dew point of a specified area (more on dew point below). Take the example where the dew point is 65 degrees and the air temp is 65 degrees. Dew point will be a more reliable in determing comfort level during warm summer days.Dew point measures how much moisture is in the air.Relative humidity is temperature dependent while dew point is not.If there is a lot of water vapor in the air, the humidity will be high.
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