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')
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5
20 0.103 18 16 14 12 10 8 5 2 -2 -7 -13 -21 -37
21 0.108 19 18 16 14 12 9 7 3 0 -4 -9 -16 -27 -60
22 0.113 20 19 17 15 13 11 8 5 +2 -2 -6 -12 -20 -36
23 0.118 21 20 18 16 14 12 10 7 4 0 -4 -9 -16 -26 -57
24 0.124 23 21 19 17 15 13 11 9 6 +2 -1 -6 -12 -20 -35
25 0.130 24 22 20 19 17 15 13 10 8 5 +1 -3 -8 -15 -25
26 0.136 25 23 22 20 18 16 14 12 9 7 3 -1 -5 -11 -18
27 0.143 26 24 23 21 19 18 16 13 11 8 5 +2 -2 -7 -14
28 0.150 27 25 24 22 21 19 17 15 13 10 7 4 0 -4 -9
29 0.157 28 26 25 23 22 20 18 16 14 12 9 6 +3 -1 -5
30 0.164 29 27 26 25 23 21 20 18 16 14 11 8 5 +2 -2
31 0.172 30 28 27 26 24 23 21 19 17 15 13 10 8 4 0
32 0.180 31 30 28 27 25 24 22 21 19 17 15 12 10 7 +3
33 0.187 32 31 29 28 27 25 24 22 20 18 16 14 12 9 6
34 0.195 33 32 30 29 28 26 25 23 22 20 18 16 13 11 8
35 0.203 34 33 31 30 29 28 26 25 23 21 19 17 15 13 10
36 0.211 35 34 32 31 30 29 27 26 24 23 21 19 17 15 12
37 0.219 36 35 33 32 31 30 28 27 26 24 22 21 19 17 14
38 0.228 37 36 34 33 32 31 29 28 27 25 24 22 20 18 16
39 0.237 38 37 35 34 33 32 31 29 28 27 25 23 22 20 18
40 0.247 39 38 37 35 34 33 32 30 29 28 26 25 23 21 20
41 0.256 40 39 38 36 35 34 33 31 30 29 27 26 24 23 21
42 0.266 41 40 39 38 36 35 34 33 31 30 29 27 26 24 23
43 0.277 42 41 40 39 37 36 35 34 32 31 30 28 27 25 24
44 0.287 43 42 41 40 38 37 36 35 34 32 31 30 28 27 25
45 0.298 44 43 42 41 40 38 37 36 35 34 32 31 30 28 27
46 0.310 45 44 43 42 41 40 38 37 36 35 33 32 31 29 28
47 0.322 46 45 44 43 42 41 40 38 37 36 35 33 32 31 29
48 0.334 47 46 45 44 43 42 41 40 38 37 36 35 33 32 31
49 0.347 48 47 46 45 44 43 42 41 40 38 37 36 34 33 32