Have you ever wondered why some hot days feel comfortable while others feel miserably sticky? The answer is dewpoint. Our calculator helps you find the dewpoint temperature based on the current air temperature and relative humidity. It tells you exactly how much moisture is in the air.
Follow these simple steps to use the calculator:
- First, enter the current Air Temperature.
- Example: If it is 80 degrees outside, type 80 in the top box.
- Next, select your units.
- Choose between Fahrenheit (°F) or Celsius (°C) from the dropdown menu.
- Then, enter the Relative Humidity.
- This number should be a percentage between 0 and 100. For example, enter 65 for 65% humidity.
- Finally, click “Calculate Dewpoint” to see your result instantly.
Dewpoint Calculator
— Dewpoint will appear here —
Frequently Asked Questions
What exactly is dewpoint?
Dewpoint is the temperature to which air must be cooled to become saturated with water vapor, causing water to condense into dew, fog, or clouds. Unlike relative humidity, which changes with the air temperature, dewpoint is an absolute measure of how much moisture is actually in the air. A higher dewpoint always means there is more moisture.
Why is dewpoint a better measure of comfort than humidity?
Relative humidity can be misleading. For instance, 50% humidity on a cold day feels very different from 50% humidity on a hot day. Dewpoint, however, gives a direct indication of how “muggy” or “sticky” the air will feel.
- Dewpoint below 55°F (13°C): Feels dry and comfortable.
- Dewpoint 55°F to 65°F (13°C to 18°C): Starts to feel sticky or humid.
- Dewpoint above 65°F (18°C): Feels oppressive and muggy, as sweat doesn’t evaporate easily.
Can the dewpoint be higher than the air temperature?
No, the dewpoint temperature can never be higher than the air temperature. When the air temperature cools down to meet the dewpoint, the air is 100% saturated. If they are equal, it means the relative humidity is 100%.