Calculate dew point temperature from air temperature and relative humidity. Understand comfort levels, condensation risk, and humidity concepts.
Dew Point
60.2°F
OK
Comfortable for most, slightly humid.
Spread: 14.8°F
Saturation Vapor Pressure
29.58 hPa
Actual Vapor Pressure
17.75 hPa
Absolute Humidity
0.13 g/m³
Vapor Pressure Deficit
11.83 hPa
Dew Point
60.2°F
OK
Comfortable for most, slightly humid.
Consider light dehumidification
* These are general predictions based on dew point alone. Actual weather depends on many factors.
Dew point is the temperature at which air becomes saturated and water vapor condenses. Higher dew point = more moisture in air. Dew point above 65F feels humid, above 70F is oppressive. Formula (Magnus): Dew Point = 243.04 x [ln(RH/100) + (17.625 x T)/(243.04 + T)] / [17.625 - ln(RH/100) - (17.625 x T)/(243.04 + T)]. Example: 80F and 60% humidity = 64F dew point.
Dew point is the temperature at which air becomes saturated with water vapor (100% relative humidity). If air cools to the dew point, water vapor condenses into dew, fog, or clouds. Higher dew points mean more moisture in the air.
Relative humidity tells you how close the air is to saturation at the current temperature. Dew point tells you the actual amount of moisture. A 50% RH day can feel dry (low dew point) or humid (high dew point) depending on temperature.
Below 55°F (13°C) feels comfortable. 55-65°F (13-18°C) is noticeable but ok. Above 65°F (18°C) feels humid. Above 70°F (21°C) is oppressive. Above 75°F (24°C) is dangerous for prolonged exposure.
Dew point indicates moisture available for precipitation. When air temp drops to dew point, condensation forms (fog, dew, frost). The spread between temp and dew point helps predict weather conditions.
Indoor dew point should be 40-50°F (4-10°C) for comfort. Too low causes dry skin and static. Too high promotes mold and dust mites. Air conditioners naturally lower dew point by removing moisture.
Dew Point
60.2°F
OK
Comfortable for most, slightly humid.