50% relative humidity can feel bone-dry at 100°F or damp at 40°F — because relative humidity is defined relative to temperature. Dew point isn't: a dew point of 65°F feels sticky whether the air itself is 70°F or 95°F, which makes it a much better single number for how muggy the air actually feels.
Dew point vs humidity, why they diverge
Enter temperature and relative humidity and this calculator converts to dew point using the Magnus formula, a standard meteorological approximation accurate to within about 0.4°C for typical conditions.
Dew point comfort chart, in plain language
Instead of just a number, the result includes a comfort label — from "Dry" through "Comfortable," "Muggy," and up to "Oppressive" — so the raw dew point translates directly into how it'll actually feel outside.
How to calculate dew point, in °F or °C
The Magnus formula itself works in Celsius, so °F inputs are converted before calculating and the result converted back — switch units freely depending on what you're used to.
