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    Relative Humidity Table

    Derived From Web-Bulb and Dry-Bulb Temperatures (°C)

    This table gives the approximate relative humidity directly from the reading of the air temperature (dry bulb) and the wet bulb. It is computed for a pressure of 74.27 cm Hg. Errors resulting from the use of this table for air temperatures above 10°C and between 77.5 and 71 cm Hg will usually be within the errors of observation. Tables for different pressures (Fahrenheit only) are available from the National Weather Service Forecast Office in Sacramento, California.

    t = dry-bulb temperature
    T = wet-bulb temperature
    t-T – wet-bulb depression

    Condensed from Bulletin of the U.S. Weather Bureau No. 1071
    °C   t-T
    t 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
    -10 93 87 80 74 67 61 54 48 41 35 28 22 16 9 3.0
    -9 94 88 81 75 69 63 57 51 45 39 33 27 21 15 9 3.2
    -8 94 88 83 77 71 65 60 54 48 43 37 32 26 20 15 10 3.4 3.6
    -7 95 89 84 78 73 67 62 57 52 46 41 36 31 25 20 15 10 5 3.8
    -6 95 90 85 79 74 69 64 59 54 49 45 40 35 30 25 20 15 11 6 4.0
    -5 95 90 86 81 76 71 66 62 57 52 48 43 39 34 29 25 20 16 11 7
    -4 95 91 86 82 77 73 68 64 59 55 51 46 42 38 33 29 25 21 17 12 4.5
    -3 96 91 87 82 78 74 70 66 62 57 53 49 45 41 37 33 29 25 21 17 8
    -2 96 92 88 84 79 75 71 68 64 60 56 52 48 44 40 37 33 29 25 22 12 5.0
    -1 96 92 88 84 81 77 73 69 66 62 58 54 51 47 43 40 36 33 29 26 17 8 5.5
    0 96 93 89 85 81 78 74 71 67 64 60 57 53 50 46 43 40 36 33 29 21 13 5
    1 97 93 90 86 83 80 76 73 70 66 63 59 56 53 49 46 43 40 36 33 25 17 10 6.0
    2 97 93 90 87 84 81 78 74 71 68 65 62 59 55 52 49 46 43 40 37 29 22 14 7 6.5
    3 97 94 91 88 84 82 78 76 72 70 67 64 61 58 55 52 49 46 43 40 33 26 19 12 5
    4 97 94 91 88 85 82 79 77 74 71 68 65 62 60 57 54 51 48 46 43 36 29 22 16 9 7.0
    5 97 94 91 88 86 83 80 77 75 72 69 67 64 61 58 56 53 51 48 45 39 33 26 20 13 7 7.5
    6 97 94 92 89 86 84 81 78 76 73 70 68 65 63 60 58 55 53 50 48 41 35 29 24 17 11 5
    7 97 95 92 89 87 84 82 79 77 74 72 69 67 64 62 59 57 54 52 50 44 38 32 26 21 15 10 8.0
    8 97 95 92 90 87 85 82 80 77 75 73 70 68 65 63 61 58 56 54 51 46 40 35 29 24 19 14 8 8.5
    9 98 95 93 90 88 85 83 81 78 76 74 71 69 67 64 62 60 58 55 53 48 42 37 32 27 22 17 12 7 9.0
    10 98 95 93 90 88 86 83 81 79 77 74 72 70 68 66 63 61 59 57 55 50 44 39 34 29 24 20 15 10 6 9.5
    11 98 95 93 91 89 86 84 82 80 78 75 73 71 69 67 65 62 60 58 56 51 46 41 36 32 27 22 18 13 9 5
    12 98 96 93 91 89 87 85 82 80 78 76 74 72 70 68 66 64 62 60 58 53 48 43 39 34 29 25 21 16 12 8 10.0
    13 98 96 93 91 89 87 85 83 81 79 77 75 73 71 69 67 65 63 61 59 54 50 45 41 36 32 28 23 19 15 11 7 10.5
    14 98 96 94 92 90 88 86 84 82 79 78 76 74 72 70 68 66 64 62 60 56 51 47 42 38 34 30 26 22 18 14 10 6 11.0
    15 98 96 94 92 90 88 86 84 82 80 78 76 74 73 71 69 67 65 63 61 57 53 48 44 40 36 32 27 24 20 16 13 9 6
    °C   t-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 8.5 9.0 9.5 10.0 10.5 11.0 11.5
    16 95 90 85 81 76 71 67 63 58 54 50 46 42 38 34 30 26 23 19 15 12 8 5
    17 95 90 86 81 76 72 68 64 60 55 51 47 43 40 36 32 28 25 21 18 14 11 8 12.0
    18 95 91 86 82 77 73 69 65 61 57 53 49 45 41 38 34 30 27 23 20 17 14 10 7 12.5
    19 95 91 87 82 78 74 70 65 62 58 54 50 46 43 39 36 32 29 26 22 19 16 13 10 7 13.0
    20 96 91 87 83 78 74 70 66 63 59 55 51 48 44 41 37 34 31 28 24 21 18 15 12 9 6 13.5
    21 96 91 87 83 79 75 71 67 64 60 56 53 49 46 42 39 36 32 29 26 23 20 17 14 12 9 6 14.0
    22 96 92 87 83 80 76 72 68 64 61 57 54 50 47 44 40 37 34 31 28 25 22 19 17 14 11 8 6 14.5
    23 96 92 88 84 80 76 72 69 65 62 58 55 52 48 45 42 39 36 33 30 27 24 21 19 16 13 11 8 6 15.0
    24 96 92 88 84 80 77 73 69 66 62 59 56 53 49 46 43 40 37 34 31 29 26 23 20 18 15 13 10 8 5
    25 96 92 88 84 81 77 74 70 67 63 60 57 54 50 47 44 41 39 36 33 30 28 25 22 20 17 15 12 10 8 16.0
    26 96 92 88 85 81 78 74 71 67 64 61 58 54 51 49 46 43 40 37 34 32 29 26 24 21 19 17 14 12 10 5
    27 96 92 89 85 82 78 75 71 68 65 62 58 56 52 50 47 44 41 38 36 33 31 28 26 23 21 18 16 14 12 7 17.0
    28 96 93 89 85 82 78 75 72 69 65 62 59 56 53 51 48 45 42 40 37 34 32 29 27 25 22 20 18 16 13 9 5
    29 96 93 89 86 82 79 76 72 69 66 63 60 57 54 52 49 46 43 41 38 36 33 31 28 26 24 22 19 17 15 11 7 18.0
    30 96 93 89 86 83 79 76 73 70 67 64 61 58 55 52 50 47 44 42 39 37 35 32 30 28 25 23 21 19 17 13 9 5
    31 96 93 90 86 83 80 77 73 70 67 64 61 59 56 53 51 48 45 43 40 38 36 33 31 29 27 25 22 20 18 14 11 7 19.0
    32 96 93 90 86 83 80 77 74 71 68 65 62 60 57 54 51 49 46 44 41 39 37 35 32 30 28 26 24 22 20 16 12 9 5
    33 97 93 90 87 83 80 77 74 71 68 66 63 60 57 55 52 50 47 45 42 40 38 36 33 31 29 27 25 23 21 17 14 10 7 20.0
    34 97 93 90 87 84 81 78 75 72 69 66 63 61 58 56 53 51 48 46 43 41 39 37 35 32 30 28 26 24 23 19 15 12 8 5
    35 97 94 90 87 84 81 78 75 72 69 67 64 61 59 56 54 51 49 47 44 42 40 38 36 34 32 30 28 26 24 20 17 13 10 7
    36 97 94 90 87 84 81 78 75 73 70 67 64 62 59 57 54 52 50 48 45 43 41 39 37 35 33 31 29 27 25 21 18 15 11 8
    37 97 94 91 87 84 82 79 76 73 70 68 65 63 60 58 55 53 51 48 46 44 42 40 38 36 34 32 30 28 26 23 19 16 13 10
    38 97 94 91 88 84 82 79 76 74 71 68 66 63 61 58 56 54 51 49 47 45 43 41 39 37 35 33 31 29 27 24 20 17 14 11
    39 97 94 91 88 85 82 79 77 74 71 69 66 64 61 59 57 54 52 50 48 46 43 42 39 38 36 34 32 30 28 25 22 18 15 12
    40 97 94 91 88 85 82 80 77 74 72 69 67 64 62 59 57 54 53 51 48 46 44 42 40 38 36 35 33 31 29 26 23 20 16 14

    Relative Humidity Table (PDF)

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