Dew Point Calculator

Calculate dew point temperature from air temperature and relative humidity. Understand comfort levels, condensation risk, and humidity concepts.

Dew Point Analysis

Dew Point

60.2°F

OK

Air Temperature75°F
Relative Humidity60%
Absolute Humidity0.13 g/m³
OK

Comfortable for most, slightly humid.

Units

Weather Conditions

0110
1100

Temperature vs Dew Point

Air: 75°F
Dew: 60.2°F
0°F55°F110°F

Spread: 14.8°F

Technical Details

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 Comfort Scale

Dry<50°F
Comfortable50-55°F
OK55-60°F
Sticky60-65°F
Uncomfortable65-70°F
Oppressive70-75°F
Miserable>75°F

Dew Point Analysis

Dew Point

60.2°F

OK

Air Temperature75°F
Relative Humidity60%
Absolute Humidity0.13 g/m³
OK

Comfortable for most, slightly humid.

Quick Answer

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.

Key Facts

  • Dew point is when relative humidity reaches 100%
  • Below 55F dew point: dry and comfortable
  • 55-60F: comfortable
  • 60-65F: starting to feel humid
  • 65-70F: humid, uncomfortable for many
  • Above 70F: oppressive, tropical humidity
  • Dew point cannot exceed air temperature
  • Condensation occurs when surface temp drops below dew point

Frequently Asked Questions

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.