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Weather Talk: Dew point temperature is a better measure of humidity discomfort

If you get your current weather information in the morning, you should know that the morning relative humidity is not a useful indicator of how humid the weather will be today. In fact, the relative humidity is fairly useless as an indication of ...

If you get your current weather information in the morning, you should know that the morning relative humidity is not a useful indicator of how humid the weather will be today. In fact, the relative humidity is fairly useless as an indication of humidity discomfort because it tells us not the percentage of humidity, but the percentage of water vapor saturation. The temperature is usually cooler in the morning and the relative humidity is usually 80 to 100 percent because cooler air saturates more readily. Later in the day, it might be 20 degrees warmer, and even with the same mass of water vapor in the air, the relative humidity usually is around 30 to 50 percent. The dew point temperature is a much better measure of humidity discomfort. Air with dew points in the 50s and below does not feel muggy. As the dew point rises through the 60s and 70s, it feels increasingly humid.

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