Table 1 - Temperature of dew point in degrees Fahrenheit

[Pressure = 30.00 inches]

Air
Temp
t

Vapor
Press.
e

Depression of wet-bulb thermometer (t-t')

23.0 23.5 24.0 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0
64 0.595 -54
65 0.616 -22
66 0.638 -11 -22                          
67 0.661 -3 -11 -23
68 0.684 +2 -3 -11 -24
69 0.707 7 +2 -3 -11 -24
70 0.732 11 7 +2 -3 -11 -24
71 0.757 14 11 7 +3 -3 -11 -24                
72 0.783 17 14 11 7 +3 -3 -11 -24
73 0.810 20 17 15 11 8 +3 -3 -11 -24
74 0.838 23 20 18 15 12 8 +3 -3 -10 -24
75 0.866 25 23 21 18 15 12 8 +4 -2 -10 -23
76 0.896 27 25 23 21 18 15 12 8 +4 -2 -10 -22      
77 0.926 29 28 26 23 21 18 16 13 9 +4 -2 -9 -21
78 0.957 31 30 28 26 24 21 19 16 13 9 +5 -1 -9 -20
79 0.989 34 32 30 28 26 24 22 19 16 13 10 +5 -1 -8 -20
80 1.022 36 34 32 30 28 26 24 22 20 17 13 10 +6 0 -7