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')
8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0
23 0.118 -51
24 0.124 -32                              
25 0.130 -24 -43
26 0.136 -18 -29
27 0.143 -13 -22 -36
28 0.150 -9 -16 -25 -48
29 0.157 -6 -11 -18 -30                        
30 0.164 -3 -7 -13 -22 -37
31 0.172 0 -4 -9 -15 -25 -48
32 0.180 +3 -1 -5 -10 -17 -29
33 0.187 5 +2 -2 -6 -12 -20 -34
34 0.195 8 5 +1 -3 -7 -14 -22 -42                
35 0.203 10 7 4 0 -4 -9 -15 -26 -52
36 0.211 12 9 6 +3 0 -5 -10 -17 -29
37 0.219 14 11 9 6 +3 -1 -6 -11 -19 -34
38 0.228 15 13 11 8 6 +2 -2 -6 -13 -22 -40
39 0.237 17 15 13 11 8 5 +1 -3 -7 -14 -24 -48        
40 0.247 19 17 15 13 10 8 5 +1 -3 -8 -16 -27
41 0.256 21 19 17 15 13 10 7 4 0 -4 -10 -17 -30
42 0.266 22 20 19 17 15 12 10 7 +4 0 -5 -11 -18 -33
43 0.277 23 22 20 18 17 14 12 10 7 +3 -1 -5 -12 -20 -37
44 0.287 25 23 22 20 18 16 14 12 9 6 +3 -1 -6 12 -22 -43
45 0.298 26 25 23 22 20 18 16 14 12 9 6 +3 -2 -7 -13 -23
46 0.310 27 26 24 23 21 20 18 16 14 11 9 6 +2 -2 -7 -14
47 0.322 29 27 26 24 23 21 20 18 16 14 11 9 6 +2 -2 -8
48 0.334 30 29 27 26 24 23 21 19 18 16 13 11 8 5 +1 -3
49 0.347 31 30 29 27 26 24 23 21 19 18 15 13 11 8 5 +1