EARTH SCIENCE LAB
Relative Humidity and Dew-Point Temperature Tables
| Table A. Relative Humidity Table |
| |
Dry Bulb - Wet Bulb Temperature Difference (°C) |
| °C |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
| -20 |
28 |
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
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| -18 |
40 |
|
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|
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|
|
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|
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|
|
|
|
|
|
|
|
| -16 |
48 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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| -14 |
55 |
11 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| -12 |
61 |
23 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| -10 |
66 |
33 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| -8 |
71 |
41 |
13 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| -6 |
73 |
48 |
20 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| -4 |
77 |
54 |
32 |
11 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| -2 |
79 |
58 |
37 |
20 |
1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 0 |
81 |
63 |
45 |
28 |
11 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 2 |
83 |
67 |
51 |
36 |
20 |
6 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 4 |
85 |
70 |
56 |
42 |
27 |
14 |
3 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 6 |
86 |
72 |
59 |
46 |
35 |
22 |
10 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 8 |
87 |
74 |
62 |
51 |
39 |
28 |
17 |
6 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 10 |
88 |
76 |
65 |
54 |
43 |
33 |
24 |
13 |
4 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 12 |
88 |
78 |
67 |
57 |
48 |
38 |
28 |
19 |
10 |
2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 14 |
89 |
79 |
69 |
60 |
50 |
41 |
33 |
25 |
16 |
8 |
1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 16 |
90 |
80 |
71 |
62 |
54 |
45 |
37 |
29 |
21 |
14 |
7 |
1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| 18 |
91 |
81 |
72 |
64 |
56 |
48 |
40 |
33 |
26 |
19 |
12 |
6 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| 20 |
91 |
82 |
74 |
66 |
58 |
51 |
44 |
36 |
30 |
23 |
17 |
11 |
5 |
|
|
|
|
|
|
|
|
|
|
|
|
| 22 |
92 |
83 |
75 |
68 |
60 |
53 |
46 |
40 |
33 |
27 |
21 |
15 |
10 |
4 |
|
|
|
|
|
|
|
|
|
|
|
| 24 |
92 |
84 |
76 |
69 |
62 |
55 |
49 |
42 |
36 |
30 |
25 |
20 |
14 |
9 |
4 |
|
|
|
|
|
|
|
|
|
|
| 26 |
92 |
85 |
77 |
70 |
64 |
57 |
51 |
45 |
39 |
34 |
28 |
23 |
18 |
13 |
9 |
5 |
|
|
|
|
|
|
|
|
|
| 28 |
93 |
86 |
78 |
71 |
65 |
59 |
53 |
45 |
42 |
36 |
31 |
26 |
21 |
17 |
12 |
8 |
4 |
|
|
|
|
|
|
|
|
| 30 |
93 |
86 |
79 |
72 |
66 |
61 |
55 |
49 |
44 |
39 |
34 |
29 |
25 |
20 |
16 |
12 |
8 |
4 |
|
|
|
|
|
|
|
| 32 |
93 |
86 |
80 |
73 |
68 |
62 |
56 |
51 |
46 |
41 |
36 |
32 |
27 |
22 |
19 |
14 |
11 |
8 |
4 |
|
|
|
|
|
|
| 34 |
93 |
86 |
81 |
74 |
69 |
63 |
58 |
52 |
48 |
43 |
38 |
34 |
30 |
26 |
22 |
18 |
14 |
11 |
8 |
5 |
|
|
|
|
|
| 36 |
94 |
87 |
81 |
75 |
69 |
64 |
59 |
54 |
50 |
44 |
40 |
36 |
32 |
28 |
24 |
21 |
17 |
13 |
10 |
7 |
4 |
|
|
|
|
| 38 |
94 |
87 |
82 |
76 |
70 |
66 |
60 |
55 |
51 |
46 |
42 |
38 |
34 |
30 |
26 |
23 |
20 |
16 |
13 |
10 |
7 |
5 |
|
|
|
| 40 |
94 |
89 |
82 |
76 |
71 |
67 |
61 |
57 |
52 |
48 |
44 |
40 |
36 |
33 |
29 |
25 |
22 |
19 |
16 |
13 |
10 |
7 |
4 |
|
|
| 42 |
94 |
88 |
83 |
77 |
72 |
67 |
63 |
58 |
54 |
50 |
46 |
42 |
37 |
34 |
31 |
28 |
25 |
21 |
18 |
16 |
12 |
9 |
7 |
4 |
|
| 44 |
94 |
89 |
82 |
78 |
73 |
68 |
64 |
59 |
55 |
51 |
47 |
43 |
39 |
36 |
33 |
29 |
26 |
23 |
21 |
18 |
15 |
12 |
9 |
7 |
5 |
| Table B. Dew Point Temperature Table |
| Dry Bulb - Wet Bulb Temperature Difference (°C) |
| °C |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
| -20 |
-33 |
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
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|
|
| -18 |
-28 |
|
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|
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|
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| -16 |
-24 |
|
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|
|
|
|
|
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|
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| -14 |
-21 |
-36 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| -12 |
-18 |
-28 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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| -10 |
-14 |
-22 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
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| -8 |
-12 |
-18 |
-29 |
|
|
|
|
|
|
|
|
|
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|
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|
|
|
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|
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|
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| -6 |
-10 |
-14 |
-22 |
|
|
|
|
|
|
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|
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|
|
|
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|
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| -4 |
-7 |
-12 |
-17 |
-29 |
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
| -2 |
-5 |
-8 |
-13 |
-20 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
| 0 |
-3 |
-6 |
-9 |
-15 |
-24 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 2 |
-1 |
-3 |
-6 |
-11 |
-17 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 4 |
1 |
-1 |
-4 |
-7 |
-11 |
-19 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 6 |
4 |
1 |
-1 |
-4 |
-7 |
-13 |
-21 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 8 |
6 |
3 |
1 |
-2 |
-5 |
-9 |
-14 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 10 |
8 |
6 |
4 |
1 |
-2 |
-5 |
-9 |
-14 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 12 |
10 |
8 |
6 |
4 |
1 |
-2 |
-5 |
-9 |
-16 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 14 |
12 |
11 |
9 |
6 |
4 |
1 |
-2 |
-5 |
-10 |
-17 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 16 |
14 |
13 |
11 |
9 |
7 |
4 |
1 |
-1 |
-6 |
-10 |
-17 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 18 |
16 |
15 |
13 |
11 |
9 |
7 |
4 |
2 |
-2 |
-5 |
-10 |
-19 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| 20 |
19 |
17 |
15 |
14 |
12 |
10 |
7 |
4 |
2 |
-2 |
-5 |
-10 |
-19 |
|
|
|
|
|
|
|
|
|
|
|
|
| 22 |
21 |
19 |
17 |
16 |
14 |
12 |
10 |
8 |
5 |
3 |
-1 |
-5 |
-10 |
-19 |
|
|
|
|
|
|
|
|
|
|
|
| 24 |
23 |
21 |
20 |
18 |
16 |
14 |
12 |
10 |
8 |
6 |
2 |
-1 |
-5 |
-10 |
-18 |
|
|
|
|
|
|
|
|
|
|
| 26 |
25 |
23 |
22 |
20 |
18 |
17 |
15 |
13 |
11 |
9 |
6 |
3 |
0 |
-4 |
-9 |
-18 |
|
|
|
|
|
|
|
|
|
| 28 |
27 |
25 |
24 |
22 |
21 |
19 |
17 |
16 |
14 |
11 |
9 |
7 |
4 |
1 |
-3 |
-9 |
-16 |
|
|
|
|
|
|
|
|
| 30 |
29 |
27 |
26 |
24 |
23 |
21 |
19 |
18 |
16 |
14 |
12 |
10 |
8 |
5 |
1 |
-2 |
-8 |
-15 |
|
|
|
|
|
|
|
| 32 |
31 |
29 |
28 |
27 |
25 |
24 |
22 |
21 |
19 |
17 |
15 |
13 |
11 |
8 |
5 |
2 |
-2 |
-7 |
-14 |
|
|
|
|
|
|
| 34 |
33 |
31 |
30 |
29 |
27 |
26 |
24 |
23 |
21 |
20 |
18 |
16 |
14 |
12 |
9 |
6 |
3 |
-1 |
-5 |
-12 |
|
|
|
|
|
| 36 |
35 |
33 |
32 |
31 |
29 |
28 |
27 |
25 |
24 |
22 |
20 |
19 |
17 |
15 |
13 |
10 |
7 |
4 |
0 |
-4 |
-10 |
|
|
|
|
| 38 |
37 |
35 |
34 |
33 |
32 |
30 |
29 |
28 |
26 |
25 |
23 |
21 |
19 |
17 |
15 |
13 |
11 |
8 |
5 |
1 |
-3 |
-7 |
|
|
|
| 40 |
39 |
37 |
36 |
35 |
34 |
32 |
31 |
30 |
28 |
27 |
25 |
24 |
22 |
20 |
18 |
16 |
14 |
12 |
9 |
6 |
2 |
-2 |
-9 |
|
|
| 42 |
41 |
40 |
39 |
37 |
36 |
35 |
34 |
32 |
31 |
29 |
28 |
26 |
24 |
23 |
21 |
20 |
18 |
15 |
13 |
11 |
7 |
3 |
-1 |
-8 |
|
| 44 |
43 |
42 |
40 |
39 |
38 |
37 |
36 |
34 |
33 |
32 |
30 |
29 |
27 |
26 |
24 |
22 |
20 |
18 |
17 |
14 |
12 |
8 |
4 |
1 |
-4 |