Table 2 - Temperature of dew point in degrees Fahrenheit

[Pressure = 29.00 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 18 17 15 13 11 8 5 2 -1 -5 -11 -18 -30
21 0.108 19 48 16 14 12 10 7 4 +1 -3 -8 -14 -23 -42
22 0.113 20 19 17 15 13 11 9 6 3 -1 -5 -10 -17 -29
23 0.118 22 20 18 16 14 12 10 8 5 +1 -3 -7 -13 -22 -40
24 0.124 23 21 19 18 16 14 11 9 6 3 0 -4 -10 -17 -28  
25 0.130 24 22 21 19 17 15 13 11 8 5 +2 -2 -6 -12 -21 -36
26 0.136 25 23 22 20 18 16 14 12 10 7 4 0 -4 -9 -15 -26
27 0.143 26 24 23 21 20 18 16 14 12 9 6 +3 -1 -5 -11 -19
28 0.150 27 25 24 22 21 19 17 15 13 11 8 5 +2 -2 -7 -14
29 0.157 28 26 25 24 22 20 19 17 15 12 10 7 4 0 -4 -9
30 0.164 29 27 26 25 23 22 20 18 16 14 12 9 6 +3 -1 -5
31 0.172 30 29 27 26 24 23 21 20 18 16 13 11 8 5 +2 -2
32 0.180 31 30 28 27 26 24 23 21 19 17 15 13 10 8 4 +1
33 0.187 32 31 29 28 27 25 24 22 21 19 17 15 12 10 7 3
34 0.195 33 32 30 29 28 27 25 24 22 20 18 16 14 12 9 6
35 0.203 34 33 31 30 29 28 26 25 23 22 20 18 16 14 11 8
36 0.211 35 34 32 31 30 29 27 26 25 23 21 20 18 15 13 11
37 0.219 36 35 33 32 31 30 28 27 26 24 23 21 19 17 15 13
38 0.228 37 36 34 33 32 31 30 28 27 26 24 23 21 19 17 14
39 0.237 38 37 36 34 33 32 31 29 28 27 25 24 22 21 19 16
40 0.247 39 38 37 35 34 33 32 31 29 28 27 25 23 22 20 18
41 0.256 40 39 38 37 35 34 33 32 30 29 28 26 25 23 22 20
42 0.266 41 40 39 38 36 35 34 33 32 30 29 28 26 25 23 21
43 0.277 42 41 40 39 38 36 35 34 33 31 30 29 27 26 24 23
44 0.287 43 42 41 40 39 38 36 35 34 32 31 30 29 27 26 24
45 0.298 44 43 42 41 40 39 37 36 35 34 32 31 30 29 27 26
46 0.310 45 44 43 42 41 40 39 37 36 35 34 32 31 30 28 27
47 0.322 46 45 44 43 42 41 40 39 37 36 35 34 32 31 30 28
48 0.334 47 46 45 44 43 42 41 40 39 37 36 35 34 32 31 30
49 0.347 48 47 46 45 44 43 42 41 40 39 37 36 35 34 32 31