Table 4 - Temperature of dew point in degrees Fahrenheit

[Pressure = 25.00 inches]

Air
Temp
t

Vapor
Press.
e

Depression of wet-bulb thermometer (t-t')
24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 30.5 31.0 31.5 32.0
63 0.575 -30
64 0.595 -16 -30
65 0.616 -8 -16 -30
66 0.638 -2 -7 -16 -30                        
67 0.661 +3 -2 -7 -15 -30
68 0.684 7 +4 -1 -7 -15 -30
69 0.707 11 8 +4 -1 -7 -15 -29
70 0.732 14 11 8 +4 -1 -6 -14 -28
71 0.757 17 14 12 8 +4 0 -6 -14 -28              
72 0.783 19 17 15 12 9 +5 0 -5 -14 -26
73 0.810 22 20 18 15 12 9 +5 +1 -5 -13 -25
74 0.838 24 22 20 18 15 12 9 6 +1 -4 -12 -24
75 0.866 26 25 23 21 18 16 13 10 6 +2 -4 -11 -23
76 0.896 28 27 25 23 21 19 16 13 10 7 +2 -3 -10 -21 -54  
77 0.926 30 29 27 25 23 21 19 16 14 11 7 +3 -3 -9 -20 -48
78 0.957 32 31 29 27 26 24 22 19 17 14 11 8 +3 -2 -9 -19
79 0.989 34 32 31 29 28 26 24 22 20 17 15 12 8 +4 -1 -8
80 1.022 36 34 33 31 30 28 26 24 22 20 18 15 12 9 +5 0