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')
8.0 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
25 0.130 -51
26 0.136 -32
27 0.143 -23 -45
28 0.150 -17 -29
29 0.157 -12 -20 -39                        
30 0.164 -7 -14 -25 -57
31 0.172 -4 -10 -18 -31
32 0.180 -1 -6 -12 -21 -42
33 0.187 +2 -2 -7 -14 -26
34 0.195 5 +1 -3 -9 -17 -32                  
35 0.203 7 4 0 -5 -11 -20 -41
36 0.211 10 7 +3 -1 -6 -14 -25 -58
37 0.219 12 9 6 +2 -3 -8 -16 -29
38 0.228 14 11 8 5 +1 -4 -10 -19 -36
39 0.237 16 13 11 8 4 0 -5 -12 -22 -47          
40 0.247 18 15 13 10 7 +3 -1 -6 -14 -26
41 0.256 19 17 15 12 10 6 +2 -2 -8 -16 -30
42 0.266 21 19 17 14 12 9 6 +2 -3 -9 -18 -36
43 0.277 22 20 19 16 14 11 9 5 +1 -4 -11 -21 -45
44 0.287 24 22 20 18 16 13 11 8 4 0 -5 -12 -24 -60  
45 0.298 25 23 22 20 18 15 13 10 7 +4 -1 -6 -14 -27
46 0.310 27 25 23 21 20 17 15 13 10 7 +3 -2 -7 -16 -30
47 0.322 28 26 25 23 21 19 17 15 12 9 6 +2 -3 -9 -17
48 0.334 29 28 26 25 23 21 19 17 14 12 9 5 +1 -4 -10
49 0.347 30 29 28 26 24 23 21 19 16 14 11 8 5 0 -5