Dew Point Calculator
The dew point is the temperature at which air becomes saturated and water starts to condense. It is a better guide to how muggy air feels than relative humidity alone. This uses the Magnus formula with the Alduchov and Eskridge coefficients.
Work out the dew point
Frequently Asked Questions
The temperature air must cool to before water vapour condenses out of it. At that point relative humidity is 100%.
Relative humidity depends on temperature, so 70% humidity means very different things on a cold day and a hot one. Dew point is an absolute measure of how much moisture is in the air.
As a rough guide, most people find a dew point above about 16 °C (60 °F) noticeably humid, and above about 21 °C (70 °F) oppressive.
Within roughly 0.4 °C over about −40 °C to 50 °C, which is well inside everyday use.