Dry Bulb
Temp
(°C )

Table of Dewpoint as a Function of Dry Bulb and Relative Humidity

Relative Humidity (%)

10
11
12
13
14
15
16
17
18
19
20
22
24
26
28
30
32
34
-20
-44.7
-43.8
-42.9
-42.2
-41.4
-40.7
-40.1
-39.5
-38.9
-38.4
-37.8
-36.9
-36.0
-35.1
-34.3
-33.6
-32.9
-32.3
-19
-43.9
-42.9
-42.1
-41.3
-40.6
-39.9
-39.2
-38.6
-38.0
-37.5
-36.9
-36.0
-35.1
-34.2
-33.4
-32.7
-32.0
-31.4
-18
-43.0
-42.1
-41.3
-40.5
-39.7
-39.0
-38.4
-37.7
-37.2
-36.6
-36.1
-35.1
-34.2
-33.3
-32.5
-31.8
-31.1
-30.4
-17
-42.2
-41.3
-40.4
-39.6
-38.9
-38.2
-37.5
-36.9
-36.3
-35.7
-35.2
-34.2
-33.3
-32.4
-31.6
-30.9
-30.2
-29.5
-16
-41.4
-40.4
-39.6
-38.8
-38.0
-37.3
-36.6
-36.0
-35.4
-34.9
-34.3
-33.3
-32.4
-31.5
-30.7
-30.0
-29.3
-28.6
-15
-40.6
-39.6
-38.7
-37.9
-37.2
-36.5
-35.8
-35.2
-34.6
-34.0
-33.4
-32.4
-31.5
-30.6
-29.8
-29.1
-28.4
-27.7
-14
-39.8
-38.8
-37.9
-37.1
-36.3
-35.6
-34.9
-34.3
-33.7
-33.1
-32.6
-31.5
-30.6
-29.7
-28.9
-28.2
-27.4
-26.8
-13
-38.9
-38.0
-37.1
-36.2
-35.5
-34.8
-34.1
-33.4
-32.8
-32.2
-31.7
-30.7
-29.7
-28.8
-28.0
-27.3
-26.5
-25.9
-12
-38.1
-37.1
-36.2
-35.4
-34.6
-33.9
-33.2
-32.6
-32.0
-31.4
-30.8
-29.8
-28.8
-28.0
-27.1
-26.4
-25.6
-24.9
-11
-37.3
-36.3
-35.4
-34.6
-33.8
-33.1
-32.4
-31.7
-31.1
-30.5
-30.0
-28.9
-28.0
-27.1
-26.2
-25.4
-24.7
-24.0
-10
-36.5
-35.5
-34.6
-33.7
-32.9
-32.2
-31.5
-30.9
-30.2
-29.7
-29.1
-28.0
-27.1
-26.2
-25.3
-24.5
-23.8
-23.1
-9
-35.7
-34.7
-33.7
-32.9
-32.1
-31.4
-30.7
-30.0
-29.4
-28.8
-28.2
-27.2
-26.2
-25.3
-24.4
-23.6
-22.9
-22.2
-8
-34.8
-33.8
-32.9
-32.1
-31.3
-30.5
-29.8
-29.2
-28.5
-27.9
-27.4
-26.3
-25.3
-24.4
-23.5
-22.7
-22.0
-21.3
-7
-34.0
-33.0
-32.1
-31.2
-30.4
-29.7
-29.0
-28.3
-27.7
-27.1
-26.5
-25.4
-24.4
-23.5
-22.7
-21.9
-21.1
-20.4
-6
-33.2
-32.2
-31.3
-30.4
-29.6
-28.8
-28.1
-27.5
-26.8
-26.2
-25.6
-24.5
-23.5
-22.6
-21.8
-21.0
-20.2
-19.5
-5
-32.4
-31.4
-30.4
-29.6
-28.8
-28.0
-27.3
-26.6
-26.0
-25.3
-24.8
-23.7
-22.7
-21.7
-20.9
-20.1
-19.3
-18.6
-4
-31.6
-30.6
-29.6
-28.7
-27.9
-27.2
-26.4
-25.8
-25.1
-24.5
-23.9
-22.8
-21.8
-20.9
-20.0
-19.2
-18.4
-17.7
-3
-30.8
-29.8
-28.8
-27.9
-27.1
-26.3
-25.6
-24.9
-24.3
-23.6
-23.0
-21.9
-20.9
-20.0
-19.1
-18.3
-17.5
-16.8
-2
-30.0
-28.9
-28.0
-27.1
-26.3
-25.5
-24.7
-24.1
-23.4
-22.8
-22.2
-21.1
-20.0
-19.1
-18.2
-17.4
-16.6
-15.9
-1
-29.2
-28.1
-27.2
-26.3
-25.4
-24.6
-23.9
-23.2
-22.6
-21.9
-21.3
-20.2
-19.2
-18.2
-17.3
-16.5
-15.7
-15.0
0
-28.4
-27.3
-26.3
-25.4
-24.6
-23.8
-23.1
-22.4
-21.7
-21.1
-20.5
-19.3
-18.3
-17.3
-16.4
-15.6
-14.8
-14.1
1
-27.6
-26.5
-25.5
-24.6
-23.8
-23.0
-22.2
-21.5
-20.9
-20.2
-19.6
-18.5
-17.4
-16.5
-15.6
-14.7
-13.9
-13.2
2
-26.8
-25.7
-24.7
-23.8
-22.9
-22.1
-21.4
-20.7
-20.0
-19.4
-18.8
-17.6
-16.6
-15.6
-14.7
-13.8
-13.0
-12.3
3
-26.0
-24.9
-23.9
-23.0
-22.1
-21.3
-20.6
-19.8
-19.2
-18.5
-17.9
-16.8
-15.7
-14.7
-13.8
-12.9
-12.1
-11.4
4
-25.2
-24.1
-23.1
-22.2
-21.3
-20.5
-19.7
-19.0
-18.3
-17.7
-17.1
-15.9
-14.8
-13.8
-12.9
-12.0
-11.2
-10.5
5
-24.4
-23.3
-22.3
-21.3
-20.5
-19.7
-18.9
-18.2
-17.5
-16.8
-16.2
-15.0
-14.0
-13.0
-12.0
-11.2
-10.3
-9.6
6
-23.6
-22.5
-21.5
-20.5
-19.7
-18.8
-18.1
-17.3
-16.6
-16.0
-15.4
-14.2
-13.1
-12.1
-11.2
-10.3
-9.4
-8.7
7
-22.8
-21.7
-20.7
-19.7
-18.8
-18.0
-17.2
-16.5
-15.8
-15.1
-14.5
-13.3
-12.2
-11.2
-10.3
-9.4
-8.6
-7.8
8
-22.0
-20.9
-19.9
-18.9
-18.0
-17.2
-16.4
-15.7
-15.0
-14.3
-13.7
-12.5
-11.4
-10.4
-9.4
-8.5
-7.7
-6.9
9
-21.2
-20.1
-19.1
-18.1
-17.2
-16.4
-15.6
-14.8
-14.1
-13.5
-12.8
-11.6
-10.5
-9.5
-8.5
-7.6
-6.8
-6.0
10
-20.4
-19.3
-18.2
-17.3
-16.4
-15.5
-14.7
-14.0
-13.3
-12.6
-12.0
-10.8
-9.6
-8.6
-7.7
-6.8
-5.9
-5.1
11
-19.6
-18.5
-17.4
-16.5
-15.6
-14.7
-13.9
-13.2
-12.5
-11.8
-11.1
-9.9
-8.8
-7.8
-6.8
-5.9
-5.0
-4.2
12
-18.8
-17.7
-16.6
-15.7
-14.8
-13.9
-13.1
-12.3
-11.6
-10.9
-10.3
-9.1
-7.9
-6.9
-5.9
-5.0
-4.1
-3.3
13
-18.1
-16.9
-15.8
-14.9
-13.9
-13.1
-12.3
-11.5
-10.8
-10.1
-9.4
-8.2
-7.1
-6.0
-5.0
-4.1
-3.3
-2.4
14
-17.3
-16.1
-15.0
-14.1
-13.1
-12.3
-11.5
-10.7
-10.0
-9.3
-8.6
-7.4
-6.2
-5.2
-4.2
-3.2
-2.4
-1.5
15
-16.5
-15.3
-14.2
-13.2
-12.3
-11.5
-10.6
-9.9
-9.1
-8.4
-7.8
-6.5
-5.4
-4.3
-3.3
-2.4
-1.5
-0.7
16
-15.7
-14.5
-13.4
-12.4
-11.5
-10.6
-9.8
-9.0
-8.3
-7.6
-6.9
-5.7
-4.5
-3.4
-2.4
-1.5
-0.6
0.2
17
-14.9
-13.7
-12.7
-11.6
-10.7
-9.8
-9.0
-8.2
-7.5
-6.8
-6.1
-4.8
-3.7
-2.6
-1.6
-0.6
0.3
1.1
18
-14.1
-13.0
-11.9
-10.8
-9.9
-9.0
-8.2
-7.4
-6.6
-5.9
-5.3
-4.0
-2.8
-1.7
-0.7
0.2
1.1
2.0
19
-13.4
-12.2
-11.1
-10.0
-9.1
-8.2
-7.4
-6.6
-5.8
-5.1
-4.4
-3.1
-2.0
-0.9
0.2
1.1
2.0
2.9
20
-12.6
-11.4
-10.3
-9.2
-8.3
-7.4
-6.5
-5.8
-5.0
-4.3
-3.6
-2.3
-1.1
0.0
1.0
2.0
2.9
3.7
21
-11.8
-10.6
-9.5
-8.5
-7.5
-6.6
-5.7
-4.9
-4.2
-3.4
-2.8
-1.5
-0.3
0.8
1.9
2.8
3.8
4.6
22
-11.0
-9.8
-8.7
-7.7
-6.7
-5.8
-4.9
-4.1
-3.3
-2.6
-1.9
-0.6
0.6
1.7
2.7
3.7
4.6
5.5
23
-10.3
-9.0
-7.9
-6.9
-5.9
-5.0
-4.1
-3.3
-2.5
-1.8
-1.1
0.2
1.4
2.5
3.6
4.6
5.5
6.4
24
-9.5
-8.3
-7.1
-6.1
-5.1
-4.2
-3.3
-2.5
-1.7
-1.0
-0.3
1.1
2.3
3.4
4.5
5.4
6.4
7.3
25
-8.7
-7.5
-6.3
-5.3
-4.3
-3.4
-2.5
-1.7
-0.9
-0.1
0.6
1.9
3.1
4.3
5.3
6.3
7.2
8.1
26
-7.9
-6.7
-5.6
-4.5
-3.5
-2.6
-1.7
-0.9
-0.1
0.7
1.4
2.7
4.0
5.1
6.2
7.2
8.1
9.0
27
-7.2
-5.9
-4.8
-3.7
-2.7
-1.8
-0.9
0.0
0.7
1.5
2.2
3.6
4.8
5.9
7.0
8.0
9.0
9.9
28
-6.4
-5.2
-4.0
-2.9
-1.9
-1.0
-0.1
0.8
1.6
2.3
3.0
4.4
5.6
6.8
7.9
8.9
9.8
10.8
29
-5.6
-4.4
-3.2
-2.1
-1.1
-0.2
0.7
1.6
2.4
3.1
3.9
5.2
6.5
7.6
8.7
9.8
10.7
11.6
30
-4.9
-3.6
-2.4
-1.3
-0.3
0.6
1.5
2.4
3.2
3.9
4.7
6.1
7.3
8.5
9.6
10.6
11.6
12.5
31
-4.1
-2.8
-1.7
-0.6
0.5
1.4
2.3
3.2
4.0
4.8
5.5
6.9
8.2
9.3
10.4
11.5
12.4
13.4
32
-3.4
-2.1
-0.9
0.2
1.3
2.2
3.1
4.0
4.8
5.6
6.3
7.7
9.0
10.2
11.3
12.3
13.3
14.2
33
-2.6
-1.3
-0.1
1.0
2.0
3.0
3.9
4.8
5.6
6.4
7.1
8.5
9.8
11.0
12.1
13.2
14.2
15.1
34
-1.8
-0.5
0.7
1.8
2.8
3.8
4.7
5.6
6.4
7.2
8.0
9.4
10.7
11.9
13.0
14.0
15.0
16.0
35
-1.1
0.2
1.4
2.6
3.6
4.6
5.5
6.4
7.2
8.0
8.8
10.2
11.5
12.7
13.8
14.9
15.9
16.8
36
-0.3
1.0
2.2
3.3
4.4
5.4
6.3
7.2
8.0
8.8
9.6
11.0
12.3
13.5
14.7
15.7
16.7
17.7
37
0.4
1.8
3.0
4.1
5.2
6.2
7.1
8.0
8.8
9.6
10.4
11.8
13.1
14.4
15.5
16.6
17.6
18.6
38
1.2
2.5
3.8
4.9
6.0
7.0
7.9
8.8
9.6
10.4
11.2
12.7
14.0
15.2
16.4
17.4
18.5
19.4
39
1.9
3.3
4.5
5.7
6.7
7.7
8.7
9.6
10.4
11.3
12.0
13.5
14.8
16.0
17.2
18.3
19.3
20.3
40
2.7
4.0
5.3
6.4
7.5
8.5
9.5
10.4
11.2
12.1
12.8
14.3
15.6
16.9
18.1
19.1
20.2
21.2
41
3.4
4.8
6.1
7.2
8.3
9.3
10.3
11.2
12.0
12.9
13.6
15.1
16.5
17.7
18.9
20.0
21.0
22.0
42
4.2
5.6
6.8
8.0
9.1
10.1
11.1
12.0
12.8
13.7
14.5
15.9
17.3
18.6
19.7
20.8
21.9
22.9
43
4.9
6.3
7.6
8.8
9.9
10.9
11.9
12.8
13.6
14.5
15.3
16.7
18.1
19.4
20.6
21.7
22.7
23.7
44
5.7
7.1
8.3
9.5
10.6
11.7
12.6
13.6
14.4
15.3
16.1
17.6
18.9
20.2
21.4
22.5
23.6
24.6
45
6.4
7.8
9.1
10.3
11.4
12.4
13.4
14.4
15.2
16.1
16.9
18.4
19.8
21.1
22.3
23.4
24.5
25.5
46
7.2
8.6
9.9
11.1
12.2
13.2
14.2
15.1
16.0
16.9
17.7
19.2
20.6
21.9
23.1
24.2
25.3
26.3
47
7.9
9.3
10.6
11.8
12.9
14.0
15.0
15.9
16.8
17.7
18.5
20.0
21.4
22.7
23.9
25.1
26.2
27.2
48
8.7
10.1
11.4
12.6
13.7
14.8
15.8
16.7
17.6
18.5
19.3
20.8
22.2
23.5
24.8
25.9
27.0
28.0
49
9.4
10.8
12.1
13.3
14.5
15.6
16.6
17.5
18.4
19.3
20.1
21.6
23.1
24.4
25.6
26.8
27.9
28.9
50
10.1
11.6
12.9
14.1
15.3
16.3
17.3
18.3
19.2
20.1
20.9
22.4
23.9
25.2
26.4
27.6
28.7
29.8
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