Quote:
Originally Posted by Exitus Acta Probat
Is the humidity number that TWC displays in their forecast the humidity level at the same time as the day's temperature high, or is it the highest humidity level of the entire day?
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The highest humidity level (expressed as a percentage) occurs at the coldest time of the morning. The dew point remains fairly constant throughout most of the day, and that is the true reflection of how mucyh moisture is being held as vapor in the air.
The hotter it gets, the lower the humidity percent goes, because it is a measure of the moisture in the air expressed as a percentage of how much the air could hold at the temperature at that moment. When you get up in the morning and there is fog in the air or dew on the grass, that is an indicator that the humidity is 100%, the air is too cold to hold the moisture that is present, and it is forming as liquid water.
If you really want to know humidity-driven comfort,, ignore the humidity percentage, and just look at the dew point. Regardless of the temperature, you will feel fairly comfortable if the dew point is below 70, and you'll feel UNcomfortable if it is above 75. Uncomfortable humidity is unlikely to occur if the overnight low went much below 70, because that cooler air cannot hold enough moisture to feel humid when it gets hot in the afternoon.
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