Dew point is a much better measurement of comfort than relative humidity.

While relative humidity (RH) is the most commonly cited figure in weather reports, it is often misleading because it is "relative" to the air temperature. Dew point, however, is an absolute measure of how much water vapor is actually in the air. Here is the breakdown of why dew point is the superior "comfort" metric.
  1. The Problem with Relative Humidity
    Relative humidity tells you how full of moisture the air is compared to how much it could hold at that specific temperature. Warm air can hold much more water than cold air.
    • Example: A 40°F day with *90% humidity* feels crisp and dry.
    • Example: A 95°F day with *50% humidity* feels oppressive and "sticky."
    • The Conflict: Even though 90% is a higher number than 50%, the 95°F air actually contains significantly more water. Relative humidity doesn't tell you how you will feel unless you also know the exact temperature.
  2. Why Dew Point is Absolute
    The dew point is the temperature to which air must be cooled to become saturated with water vapor. It tells you exactly how much moisture is present regardless of the current temperature.
    Because it is an absolute value, you can use a simple scale to determine comfort:
    • Below 55°F: Very comfortable / Dry.
    • 55°F to 60°F: Comfortable / Pleasant.
    • 60°F to 65°F: Sticky / Becoming humid.
    • 65°F to 70°F: Uncomfortable / Muggy (AC is usually running).
    • 70°F to 75°F: Oppressive / Very miserable.
    • 75°F+: Extreme discomfort / Dangerous.
  3. The Biology of Comfort (Evaporative Cooling)
    The human body cools itself by sweating. As sweat evaporates off your skin, it carries heat away.
    • Low Dew Point: The air has plenty of "room" for your sweat to evaporate quickly, so you feel cool.
    • High Dew Point: The air is already crowded with water molecules. Your sweat cannot evaporate into the air; it just stays on your skin. This makes you feel hot, sticky, and exhausted because your body's "radiator" has stopped working.

Summary

Pro Tip: If you want to know if you’ll be comfortable outside, ignore the humidity percentage and look for the dew point. If it’s over 65°F, you are going to sweat.

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