Dew Point vs Humidity at Current Temperature
Dew Point vs Temperature at Current Humidity
How Dew Point Works
What is Dew Point?
The dew point is the temperature at which air becomes saturated with water vapor. When air cools to its dew point, water vapor begins to condense into liquid—forming dew, fog, or clouds.
Temperature's Role
Warmer air can hold more water vapor. As temperature rises with the same moisture content, relative humidity drops and the dew point stays constant. The gap between temperature and dew point widens.
Humidity's Role
Higher relative humidity means the air holds more of its maximum possible moisture. At 100% humidity, the dew point equals the air temperature—condensation begins immediately.
The Spread Matters
The difference between air temperature and dew point tells you how close you are to condensation. A small spread means fog or dew is likely; a large spread means the air feels drier.
The Math Behind It
This calculator uses the Magnus-Tetens approximation:
γ = ln(RH/100) + (b × T) / (c + T)
Dew Point = (c × γ) / (b − γ)
Where b ≈ 17.67, c ≈ 243.5°C, T is temperature in °C, and RH is relative humidity in %.