Dew Point Calculator
Calculate the dew point temperature from air temperature and relative humidity.
Understand comfort levels and condensation risk.
Dew Point
Dew point is the temperature at which air becomes saturated and water begins to condense. It tells you how muggy the air actually feels.
The Magnus formula is used:
γ(T,RH) = ln(RH/100) + (b × T) / (c + T)
Dew Point = (c × γ) / (b − γ)
Where b = 17.67 and c = 243.5°C.
Comfort levels by dew point:
- Below 50°F (10°C): Dry and comfortable
- 50–60°F (10–16°C): Comfortable
- 60–65°F (16–18°C): Starting to feel humid
- 65–70°F (18–21°C): Uncomfortable — muggy
- Above 70°F (21°C): Oppressive — very uncomfortable