Table 5 - Temperature of dew point in degrees Fahrenheit

[Pressure = 23.00 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 8.0
20 0.103 19 17 16 14 12 10 8 6 3 1 -3 -6 -11 -17 -26 -44
21 0.108 20 18 17 15 13 12 10 8 5 2 -1 -4 -8 -13 -20 -30
22 0.113 21 19 18 16 15 13 11 9 7 4 +1 -2 -5 -10 -15 -23
23 0.118 22 20 19 17 16 14 12 10 8 6 3 0 -3 -7 -12 -18
24 0.124 23 21 20 19 17 15 14 12 10 8 5 +2 -1 -4 -8 -14
25 0.130 24 23 21 20 18 17 15 13 11 9 7 4 +1 -2 -5 -10
26 0.136 25 24 22 21 20 18 16 15 13 11 9 6 4 +1 -3 -7
27 0.143 26 25 23 22 21 19 18 16 14 12 10 8 6 3 0 -4
28 0.150 27 26 24 23 22 0 19 17 16 14 12 10 8 5 +2 -1
29 0.157 28 27 26 24 23 22 20 19 17 15 13 11 9 7 4 +1
30 0.164 29 28 27 25 24 23 21 20 18 17 15 13 11 9 7 4
31 0.172 30 29 28 27 25 24 23 21 20 18 17 15 13 11 8 6
32 0.180 31 30 29 28 26 25 24 23 21 20 18 16 14 12 10 8
33 0.187 32 31 30 29 28 26 25 24 22 21 19 18 16 14 12 10
34 0.195 33 32 31 30 29 28 26 25 24 22 21 19 18 16 14 12
35 0.203 34 33 32 31 30 29 28 26 25 24 22 21 19 17 16 14
36 0.211 35 34 33 32 31 30 29 27 26 25 24 22 21 19 17 15
37 0.219 36 35 34 33 32 31 30 28 27 269 25 24 22 20 19 17
38 0.228 37 36 35 34 33 32 31 30 28 27 26 25 23 22 20 19
39 0.237 38 37 36 35 34 33 32 31 30 28 27 26 25 23 22 20
40 0.247 39 38 37 36 35 34 33 32 31 30 28 27 26 25 23 22
41 0.256 40 39 38 37 36 35 34 33 32 31 29 28 27 26 24 23
42 0.266 41 40 39 38 37 36 35 34 33 32 31 29 28 27 26 24
43 0.277 42 41 40 39 38 37 36 35 34 33 32 31 29 28 27 26
44 0.287 43 42 41 40 39 38 37 36 35 34 33 32 31 29 28 27
45 0.298 44 43 42 41 40 39 38 37 36 35 34 33 32 31 29 28
46 0.310 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30
47 0.322 46 45 44 43 42 42 41 40 38 37 36 35 34 33 32 31
48 0.334 47 46 45 44 44 43 42 41 40 39 38 37 35 34 33 32
49 0.347 48 47 46 46 45 44 43 42 41 40 39 38 37 36 34 33