How It Works
γ=ln(RH/100)+17.67T/(243.5+T); Td=243.5γ/(17.67−γ), temperatures in °C.
Uses liquid-water saturation; below freezing this is dew point over water, not frost point over ice. Limited here to air temperatures −40°C through 60°C.
Reference Sources
FAQs
How does this calculator work?
γ=ln(RH/100)+17.67T/(243.5+T); Td=243.5γ/(17.67−γ), temperatures in °C.
What assumptions should I check?
Uses liquid-water saturation; below freezing this is dew point over water, not frost point over ice. Limited here to air temperatures −40°C through 60°C.