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To simplify how to calculate the dew point, we are going to look at the dew point formula, simple-to-use calculator, and chart of dew points at different temperatures and humidity levels. The calculated dew point always depends on relative humidity levels (RH).
D = Dewpoint in Centigrade (C) degrees. Here is the same formula, but broken down into smaller pieces: L = ln(RH / 100) M = 17.27 * T. N = 237.3 + T. B = (L + (M / N)) / 17.27. D = (237.3 * B) / (1 - B) where: T = Air Temperature (Dry Bulb) in Centigrade (C) degrees. RH = Relative Humidity in percent (%) L = intermediate value (no units) .
The dew point of a given body of air is the temperature to which it must be cooled to become saturated with water vapor. This temperature depends on the pressure and water content of the air. When the air is cooled below the dew point, its moisture capacity is reduced and airborne water vapor will condense to form liquid water known as dew. [1]
If you are interested in a simpler calculation that gives an approximation of dew point temperature if you know the observed temperature and relative humidity, the following formula was proposed in a 2005 article by Mark G. Lawrence in the Bulletin of the American Meteorological Society:
This dew point calculator uses the Magnus-Tetens formula (based on the article by Mark G. Lawrence from 2005) that allows us to obtain accurate results (with an uncertainty of 0.35 °C) for temperatures ranging from -40 °C to 50 °C.
This free dew point calculator calculates dew point, relative humidity, or air temperature if given any of the other two values.
With Td = (b * α (T,RH)) / (a – α (T,RH)) formula, our dew point calculator effortlessly determines the temperature at which water vapor in the air begins to condense into liquid water, forming dew. The air temperature is 25°C (77°F) with a relative humidity of 60%.
Our dew point calculator uses the following equation: T dp = bα/(a - α) α = ln(RH%/100) + aT/(b + T) where: T dp — Dewpoint; T — Air temperature; RH — Relative humidity of the air, expressed as a percentage (e.g., 50%); a and b — The Magnus coefficients. The coefficient values recommended by Alduchov and Eskridge are: a = 17.625; and ...
You can use this dew point calculator to determine the dew point temperature (T dew) according to the temperature of the air (T) and the relative humidity (RH). You can calculate the dew point in three simple steps: Select the temperature unit between Fahrenheit (°F), Celsius (°C), or Kelvin (K).
This calculator determines the dew point from a given temperature and relative humidity of the air. The dew point is the temperature at which air must be cooled, at constant barometric pressure, for water vapor to condense into water.