Dewpoint, Wet-bulb Temperature Formula - Weather

Formula:


1) Dewpoint Temperature
Td = [243.5 x ln(e/6.112)] / [17.67 - ln(e/6.112)]
e = (es x rh) / 100
es = 6.112 x e(17.67xT)/(T+243.5)

2) Wet Bulb Temperature
Ewg = 6.112 x e(17.67xTw)/(Tw+243.5)
eg = Ewg - Psta x (T - Tw) x 0.00066 x (1 + (0.00115 x Tw))
Tw = ΣN ∀ Ed ≠ 0
Ed = e - eg



Where,

Td = Dewpoint Temperature
Tw = Wet Bulb Temperature
T = Temperature
rh = Relative Humidity
Psta = Actual station pressure
e = Vapor Pressure
es = Saturation Vapor Pressure
Ed = Vapor Pressure Difference
N = Increment by 10 and consecutive Ed is opposite sign, increment divide by 10. Its upto reach Ed is zero or absolute value of Ed is greater than 0.05

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