Calculate Relative Humidity, Dewpoint From Wet-bulb Temperature

• Temperature

  Fahrenheit Celsius Kelvin

• Wet-bulb

  Fahrenheit Celsius Kelvin

• Actual station pressure

  in of Hg mm of Hg millibars (hPA)

•  

   

• Dewpoint (Fahrenheit):

  

• (Celsius)

  

• (Kelvin)

  

•  Relative humidity (%)

  

Formula

Where,

T = Air temperature,
T_w = Wet-bulb temperature,
p_sta = Station pressure,
e_w = Vapor pressure related to wet-bulb temperature,
e_s = Saturated Vapor pressure,
e = actual vapor pressure,
rh = Relative humidity,
T_d = Dewpoint temperature.

Calculation of relative humidity and dewpoint is made easier by knowing the wet-bulb temperature.It is used in weather forecasting.