Dry Bulb
Temp
(°C )

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

Relative Humidity (%)

36
38
40
42
44
46
48
50
55
60
65
70
75
80
85
90
95
100
-20
-31.7
-31.1
-30.5
-30.0
-29.5
-29.0
-28.5
-28.1
-27.0
-26.0
-25.1
-24.3
-23.5
-22.8
-22.1
-21.4
-20.7
-20
-19
-30.7
-30.2
-29.6
-29.1
-28.5
-28.1
-27.6
-27.1
-26.1
-25.1
-24.2
-23.3
-22.5
-21.8
-21.0
-20.4
-19.7
-19
-18
-29.8
-29.2
-28.7
-28.1
-27.6
-27.1
-26.6
-26.2
-25.1
-24.1
-23.2
-22.3
-21.5
-20.8
-20.0
-19.4
-18.7
-18
-17
-28.9
-28.3
-27.7
-27.2
-26.7
-26.2
-25.7
-25.2
-24.1
-23.1
-22.2
-21.3
-20.5
-19.8
-19.0
-18.4
-17.7
-17
-16
-28.0
-27.4
-26.8
-26.2
-25.7
-25.2
-24.7
-24.3
-23.2
-22.2
-21.2
-20.4
-19.5
-18.8
-18.0
-17.4
-16.7
-16
-15
-27.0
-26.4
-25.9
-25.3
-24.8
-24.3
-23.8
-23.3
-22.2
-21.2
-20.3
-19.4
-18.6
-17.8
-17.0
-16.4
-15.7
-15
-14
-26.1
-25.5
-24.9
-24.4
-23.8
-23.3
-22.8
-22.4
-21.3
-20.2
-19.3
-18.4
-17.6
-16.8
-16.1
-15.4
-14.7
-14
-13
-25.2
-24.6
-24.0
-23.4
-22.9
-22.4
-21.9
-21.4
-20.3
-19.3
-18.3
-17.4
-16.6
-15.8
-15.1
-14.3
-13.7
-13
-12
-24.3
-23.7
-23.1
-22.5
-22.0
-21.5
-21.0
-20.5
-19.3
-18.3
-17.3
-16.4
-15.6
-14.8
-14.1
-13.3
-12.7
-12
-11
-23.4
-22.7
-22.1
-21.6
-21.0
-20.5
-20.0
-19.5
-18.4
-17.3
-16.4
-15.5
-146
-13.8
-13.1
-12.3
-11.7
-11
-10
-22.5
-21.8
-21.2
-20.6
-20.1
-19.6
-19.1
-18.6
-17.4
-16.4
-15.4
-14.5
-13.6
-12.8
-12.1
-11.3
-10.7
-10
-9
-21.5
-20.9
-20.3
-19.7
-19.2
-18.6
-18.1
-17.6
-16.5
-15.4
-14.4
-13.5
-12.7
-11.8
-11.1
-10.3
-9.7
-9
-8
-20.6
-20.0
-19.4
-18.8
-18.2
-17.7
-17.2
-16.7
-15.5
-14.5
-13.5
-12.5
-11.7
-10.9
-10.1
-9.3
-8.7
-8
-7
-19.7
-19.1
-18.5
-17.9
-17.3
-16.8
-16.2
-15.8
-14.6
-13.5
-12.5
-11.6
-10.7
-9.9
-9.1
-8.3
-7.6
-7
-6
-18.8
-18.1
-17.5
-16.9
-16.4
-15.8
-15.3
-14.8
-13.6
-12.5
-11.5
-10.6
-9.7
-8.9
-8.1
-7.4
-6.6
-6
-5
-17.9
-17.2
-16.6
-16.0
-15.4
-14.9
-14.4
-13.9
-12.7
-11.6
-10.6
-9.6
-8.7
-7.9
-7.1
-6.4
-5.6
-5
-4
-17.0
-16.3
-15.7
-15.1
-14.5
-14.0
-13.4
-12.9
-11.7
-10.6
-9.6
-8.6
-7.8
-6.9
-6.1
-5.4
-4.6
-4
-3
-16.1
-15.4
-14.8
-14.2
-13.6
-13.0
-12.5
-12.0
-10.8
-9.7
-8.6
-7.7
-6.8
-5.9
-5.1
-4.4
-3.6
-3
-2
-15.2
-14.5
-13.9
-13.2
-12.7
-12.1
-11.6
-11.1
-9.8
-8.7
-7.7
-6.7
-5.8
-4.9
-4.1
-3.4
-2.6
-2
-1
-14.2
-13.6
-12.9
-12.3
-11.7
-11.2
-10.6
-10.1
-8.9
-7.8
-6.7
-5.7
-4.8
-4.0
-3.1
-2.4
-1.6
-1
0
-13.3
-12.7
-12.0
-11.4
-10.8
-10.2
-9.7
-9.2
-7.9
-6.8
-5.8
-4.8
-3.9
-3.0
-2.2
-1.4
-0.6
0
1
-12.4
-11.8
-11.1
-10.5
-9.9
-9.3
-8.8
-8.2
-7.0
-5.9
-4.8
-3.8
-2.9
-2.0
-1.2
-0.4
0.4
1
2
-11.5
-10.8
-10.2
-9.6
-9.0
-8.4
-7.8
-7.3
-6.1
-4.9
-3.8
-2.8
-1.9
-1.0
-0.2
0.6
1.4
2
3
-10.6
-9.9
-9.3
-8.7
-8.0
-7.5
-6.9
-6.4
-5.1
-4.0
-2.9
-1.9
-0.9
0.0
0.8
1.6
2.3
3
4
-9.7
-9.0
-8.4
-7.7
-7.1
-6.5
-6.0
-5.4
-4.2
-3.0
-1.9
-0.9
0.0
0.9
1.8
2.6
3.3
4
5
-8.8
-8.1
-7.5
-6.8
-6.2
-5.6
-5.1
-4.5
-3.2
-2.1
-1.0
0.1
1.0
1.9
2.8
3.6
4.3
5
6
-7.9
-7.2
-6.6
-5.9
-5.3
-4.7
-4.1
-3.6
-2.3
-1.1
0.0
1.0
2.0
2.9
3.7
4.6
5.3
6
7
-7.0
-6.3
-5.6
-5.0
-4.4
-3.8
-3.2
-2.7
-1.4
-0.2
0.9
2.0
2.9
3.9
4.7
5.5
6.3
7
8
-6.1
-5.4
-4.7
-4.1
-3.5
-2.9
-2.3
-1.7
-0.4
0.8
1.9
2.9
3.9
4.8
5.7
6.5
7.3
8
9
-5.2
-4.5
-3.8
-3.2
-2.5
-1.9
-1.4
-0.8
0.5
1.7
2.8
3.9
4.9
5.8
6.7
7.5
8.3
9
10
-4.3
-3.6
-2.9
-2.3
-1.6
-1.0
-0.4
0.1
1.4
2.7
3.8
4.9
5.8
6.8
7.7
8.5
9.3
10
11
-3.4
-2.7
-2.0
-1.4
-0.7
-0.1
0.5
1.1
2.4
3.6
4.8
5.8
6.8
7.8
8.6
9.5
10.3
11
12
-2.6
-1.8
-1.1
-0.4
0.2
0.8
1.4
2.0
3.3
4.6
5.7
6.8
7.8
8.7
9.6
10.5
11.3
12
13
-1.7
-0.9
-0.2
0.5
1.1
1.7
2.3
2.9
4.2
5.5
6.7
7.7
8.7
9.7
10.6
11.5
12.3
13
14
-0.8
0.0
0.7
1.4
2.0
2.6
3.2
3.8
5.2
6.4
7.6
8.7
9.7
10.7
11.6
12.4
13.3
14
15
0.1
0.9
1.6
2.3
2.9
3.6
4.2
4.7
6.1
7.4
8.6
9.6
10.7
11.6
12.6
13.4
14.3
15
16
1.0
1.8
2.5
3.2
3.8
4.5
5.1
5.7
7.0
8.3
9.5
10.6
11.6
12.6
13.5
14.4
15.2
16
17
1.9
2.7
3.4
4.1
4.7
5.4
6.0
6.6
8.0
9.3
10.4
11.6
12.6
13.6
14.5
15.4
16.2
17
18
2.8
3.6
4.3
5.0
5.6
6.3
6.9
7.5
8.9
10.2
11.4
12.5
13.6
14.6
15.5
16.4
17.2
18
19
3.7
4.4
5.2
5.9
6.6
7.2
7.8
8.4
9.8
11.1
12.3
13.5
14.5
15.5
16.5
17.4
18.2
19
20
4.6
5.3
6.1
6.8
7.5
8.1
8.7
9.3
10.8
12.1
13.3
14.4
15.5
16.5
17.4
18.3
19.2
20
21
5.4
6.2
7.0
7.7
8.4
9.0
9.6
10.3
11.7
13.0
14.2
15.4
16.4
17.5
18.4
19.3
20.2
21
22
6.3
7.1
7.9
8.6
9.3
9.9
10.6
11.2
12.6
13.9
15.2
16.3
17.4
18.4
19.4
20.3
21.2
22
23
7.2
8.0
8.8
9.5
10.2
10.8
11.5
12.1
13.5
14.9
16.1
17.3
18.4
19.4
20.4
21.3
22.2
23
24
8.1
8.9
9.6
10.4
11.1
11.7
12.4
13.0
14.5
15.8
17.1
18.2
19.3
20.4
21.3
22.3
23.1
24
25
9.0
9.8
10.5
11.3
12.0
12.6
13.3
13.9
15.4
16.7
18.0
19.2
20.3
21.3
22.3
23.2
24.1
25
26
9.9
10.7
11.4
12.2
12.9
13.5
14.2
14.8
16.3
17.7
18.9
20.1
21.2
22.3
23.3
24.2
25.1
26
27
10.7
11.5
12.3
13.1
13.8
14.5
15.1
15.7
17.2
18.6
19.9
21.1
22.2
23.3
24.3
25.2
26.1
27
28
11.6
12.4
13.2
14.0
14.7
15.4
16.0
16.7
18.2
19.5
20.8
22.0
23.2
24.2
25.2
26.2
27.1
28
29
12.5
13.3
14.1
14.8
15.6
16.3
16.9
17.6
19.1
20.5
21.8
23.0
24.1
25.2
26.2
27.2
28.1
29
30
13.4
14.2
15.0
15.7
16.5
17.2
17.8
18.5
20.0
21.4
22.7
23.9
25.1
26.1
27.2
28.1
29.1
30
31
14.2
15.1
15.9
16.6
17.4
18.1
18.7
19.4
20.9
22.3
23.6
24.9
26.0
27.1
28.1
29.1
30.1
31
32
15.1
16.0
16.8
17.5
18.3
19.0
19.6
20.3
21.8
23.3
24.6
25.8
27.0
28.1
29.1
30.1
31.0
32
33
16.0
16.8
17.6
18.4
19.1
19.9
20.5
21.2
22.8
24.2
25.5
26.8
27.9
29.0
30.1
31.1
32.0
33
34
16.9
17.7
18.5
19.3
20.0
20.8
21.4
22.1
23.7
25.1
26.5
27.7
28.9
30.0
31.1
32.1
33.0
34
35
17.7
18.6
19.4
20.2
20.9
21.7
22.3
23.0
24.6
26.0
27.4
28.7
29.9
31.0
32.0
33.0
34.0
35
36
18.6
19.5
20.3
21.1
21.8
22.6
23.3
23.9
25.5
27.0
28.3
29.6
30.8
31.9
33.0
34.0
35.0
36
37
19.5
20.3
21.2
22.0
22.7
23.5
24.2
24.8
26.4
27.9
29.3
30.6
31.8
32.9
34.0
35.0
36.0
37
38
20.3
21.2
22.1
22.8
23.6
24.3
25.1
25.7
27.3
28.8
30.2
31.5
32.7
33.9
35.0
36.0
37.0
38
39
21.2
22.1
22.9
23.7
24.5
25.2
26.0
26.6
28.3
29.8
31.2
32.5
33.7
34.8
35.9
37.0
38.0
39
40
22.1
23.0
23.8
24.6
25.4
26.1
26.9
27.6
29.2
30.7
32.1
33.4
34.6
35.8
36.9
38.0
39.0
40
41
23.0
23.8
24.7
25.5
26.3
27.0
27.8
28.5
30.1
31.6
33.0
34.4
35.6
36.8
37.9
38.9
40.0
41
42
23.8
24.7
25.6
26.4
27.2
27.9
28.7
29.4
31.0
32.5
34.0
35.3
36.6
37.7
38.9
39.9
41.0
42
43
24.7
25.6
26.5
27.3
28.1
28.8
29.6
30.3
31.9
33.5
34.9
36.3
37.5
38.7
39.8
40.9
42.0
43
44
25.6
26.5
27.3
28.2
29.0
29.7
30.5
31.2
32.9
34.4
35.9
37.2
38.5
39.7
40.8
41.9
43.0
44
45
26.4
27.3
28.2
29.0
29.8
30.6
31.4
32.1
33.8
35.3
36.8
38.2
39.4
40.7
41.8
42.9
44.0
45
46
27.3
28.2
29.1
29.9
30.7
31.5
32.3
33.0
34.7
36.3
37.7
39.1
40.4
41.6
42.8
43.9
45.0
46
47
28.2
29.1
30.0
30.8
31.6
32.4
33.2
33.9
35.6
37.2
38.7
40.1
41.4
42.6
43.8
44.9
46.0
47
48
29.0
30.0
30.8
31.7
32.5
33.3
34.1
34.8
36.5
38.1
39.6
41.0
42.3
43.6
44.8
45.9
47.0
48
49
29.9
30.8
31.7
32.6
33.4
34.2
35.0
35.7
37.4
39.1
40.6
42.0
43.3
44.6
45.8
46.9
48.0
49
50
30.7
31.7
32.6
33.5
34.3
35.1
35.9
36.6
38.4
40.0
41.5
42.9
44.3
45.5
46.7
47.9
49.0
50

QPC Instruments Inc. 395 Cochrane Drive, Markham, Ontario, Canada L3R 9R5
Canada & US CustomersToll Free Phone: 1-800-868-7495 • Toll Free Fax: 1-866-399-3599
Email: cliff@qpcinstruments.com