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. A measure of the absolute moisture content of the air and the temperature air must be cooled for dew or fog to form. 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. Dews above 65 are downright muggy and even tropical when they reach the 70s. 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. Relative humidity in this situation is 100%. 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.There is a difference between dew point and relative humidity.
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