| Dew Point Degrees To Grains of Moisture Per Pound This table will give the engineer the grains of moisture per pound of air at various dew points in degrees F and C ranging from 100°F to -100°F. |
| Dew Point Degrees °F & °C To Grains/Pound | |||||||||||
| Dew Point | Dew Point | Dew Point | Dew Point | ||||||||
| Degrees °F | Degrees ° C | Grains/ Pound | Degrees °F | Degrees ° C | Grains/ Pound | Degrees °F | Degrees ° C | Grains/ Pound | Degrees °F | Degrees ° C | Grains/ Pound |
| 100 | 37.78 | 302.3 | 50 | 10.00 | 53.6 | – 1 | – 18.33 | 5.23 | – 51 | – 46.11 | .27 |
| 99 | 37.22 | 292.7 | 49 | 9.44 | 51.6 | – 2 | – 18.89 | 4.96 | – 52 | – 46.67 | .25 |
| 98 | 36.67 | 283.4 | 48 | 8.89 | 49.7 | – 3 | – 19.44 | 4.71 | – 53 | – 47.22 | .23 |
| 97 | 36.11 | 274.4 | 47 | 8.33 | 47.8 | – 4 | – 20.00 | 4.46 | – 54 | – 47.78 | .22 |
| 96 | 35.55 | 265.6 | 46 | 7.78 | 46.1 | – 5 | – 20.56 | 4.23 | – 55 | – 48.33 | .21 |
| 95 | 35.00 | 257.1 | 45 | 7.22 | 44.3 | – 6 | – 21.11 | 4.01 | – 56 | – 48.89 | .19 |
| 94 | 34.44 | 248.9 | 44 | 6.67 | 42.6 | – 7 | – 21.67 | 3.79 | – 57 | – 49.44 | .18 |
| 93 | 33.89 | 240.9 | 43 | 6.11 | 41.0 | – 8 | – 22.22 | 3.59 | – 58 | – 50.00 | .17 |
| 92 | 33.33 | 233.1 | 42 | 5.55 | 39.5 | – 9 | – 22.78 | 3.41 | – 59 | – 50.56 | .15 |
| 91 | 32.78 | 225.6 | 41 | 5.00 | 38.0 | – 10 | – 23.33 | 3.23 | – 60 | – 51.11 | .14 |
| 90 | 32.22 | 218.3 | 40 | 4.44 | 36.5 | – 11 | – 23.89 | 3.05 | – 61 | – 51.67 | .13 |
| 89 | 31.67 | 211.2 | 39 | 3.89 | 35.1 | – 12 | -24.44 | 2.89 | – 62 | – 52.22 | .13 |
| 88 | 31.11 | 204.3 | 38 | 3.33 | 33.7 | – 13 | – 25.00 | 2.73 | – 63 | – 52.78 | .12 |
| 87 | 30.55 | 197.7 | 37 | 2.78 | 32.4 | – 14 | – 25.55 | 2.58 | – 64 | – 53.33 | .11 |
| 86 | 30.00 | 191.2 | 36 | 2.22 | 31.2 | – 15 | – 26.17 | 2.44 | – 65 | – 53.89 | .10 |
| 85 | 29.44 | 184.9 | 35 | 1.67 | 29.9 | – 16 | – 26.67 | 2.31 | – 66 | – 54.44 | .09 |
| 84 | 28.89 | 178.8 | 34 | 1.11 | 28.8 | – 17 | – 27.22 | 2.18 | – 67 | – 55.00 | .09 |
| 83 | 28.33 | 173.0 | 33 | 0.56 | 27.6 | – 18 | – 27.78 | 2.06 | – 68 | – 55.56 | .08 |
| 82 | 27.78 | 167.2 | 32 | 0.00 | 26.5 | – 19 | – 28.33 | 1.95 | – 69 | – 56.11 | .07 |
| 81 | 27.22 | 161.7 | 31 | – 0.56 | 25.3 | – 20 | – 28.89 | 1.83 | – 70 | – 56.67 | .07 |
| 80 | 26.67 | 156.3 | 30 | – 1.11 | 24.2 | – 21 | – 29.44 | 1.74 | – 71 | – 57.22 | .06 |
| 79 | 26.11 | 151.1 | 29 | – 1.67 | 23.1 | – 22 | – 30.00 | 1.63 | – 72 | – 57.78 | .06 |
| 78 | 25.55 | 146.0 | 28 | – 2.22 | 22.0 | – 23 | – 30.56 | 1.55 | – 73 | – 58.33 | .05 |
| 77 | 25.00 | 141.1 | 27 | – 2.78 | 21.0 | – 24 | – 31.11 | 1.45 | – 74 | – 58.89 | .05 |
| 76 | 24.44 | 136.4 | 26 | – 3.33 | 20.1 | – 25 | – 31.67 | 1.37 | – 75 | – 59.44 | .05 |
| 75 | 23.89 | 131.7 | 25 | – 3.89 | 19.1 | – 26 | – 32.22 | 1.29 | – 76 | – 60.00 | .04 |
| 74 | 23.33 | 127.3 | 24 | – 4.44 | 18.2 | – 27 | – 32.78 | 1.22 | – 77 | – 60.56 | .04 |
| 73 | 22.78 | 123.0 | 23 | – 5.00 | 17.4 | – 28 | – 33.33 | 1.15 | – 78 | – 61.11 | .04 |
| 72 | 22.22 | 118.8 | 22 | – 5.56 | 16.6 | – 29 | – 33.89 | 1.08 | – 79 | – 61.67 | .03 |
| 71 | 21.67 | 114.7 | 21 | – 6.11 | 15.8 | – 30 | – 34.44 | 1.02 | – 80 | – 62.22 | .03 |
| 70 | 21.11 | 110.7 | 20 | – 6.67 | 15.1 | – 31 | – 35.00 | .96 | – 81 | – 62.77 | .03 |
| 69 | 20.56 | 107.0 | 19 | – 7.22 | 14.4 | – 32 | – 35.56 | .91 | – 82 | – 63.33 | .03 |
| 68 | 20.00 | 103.2 | 18 | – 7.78 | 13.7 | – 33 | – 36.11 | .85 | – 83 | – 63.89 | .02 |
| 67 | 19.44 | 99.7 | 17 | – 8.33 | 13.0 | – 34 | – 36.67 | .80 | – 84 | – 64.44 | .02 |
| 66 | 18.89 | 96.2 | 16 | – 8.89 | 12.4 | – 35 | – 37.22 | .75 | – 85 | – 65.00 | .02 |
| 65 | 18.33 | 92.8 | 15 | – 9.44 | 11.8 | – 36 | – 37.78 | .71 | – 86 | – 65.56 | .02 |
| 64 | 17.78 | 89.6 | 14 | – 10.00 | 11.2 | – 37 | – 38.33 | .69 | – 87 | – 66.11 | .02 |
| 63 | 17.22 | 86.5 | 13 | – 10.56 | 10.7 | – 38 | – 38.89 | .63 | – 88 | – 66.67 | .02 |
| 62 | 16.67 | 83.4 | 12 | – 11.11 | 10.2 | – 39 | – 39.44 | .59 | – 89 | – 67.22 | .01 |
| 61 | 16.11 | 80.4 | 11 | – 11.67 | 9.7 | – 40 | – 40.00 | .55 | – 90 | – 67.78 | .01 |
| 60 | 15.56 | 77.6 | 10 | – 12.22 | 9.2 | – 41 | – 40.56 | .52 | – 91 | – 68.33 | .01 |
| 59 | 15.00 | 74.8 | 9 | – 12.78 | 8.8 | – 42 | – 41.11 | .49 | – 92 | – 68.89 | .01 |
| 58 | 14.44 | 72.1 | 8 | – 13.33 | 8.3 | – 43 | – 41.67 | .46 | – 93 | – 69.44 | .01 |
| 57 | 13.89 | 69.5 | 7 | – 13.89 | 7.9 | – 44 | – 42.22 | .43 | – 94 | – 70.00 | .01 |
| 56 | 13.33 | 67.0 | 6 | – 14.44 | 7.5 | – 45 | – 42.78 | .40 | – 95 | – 70.56 | .01 |
| 55 | 12.78 | 64.0 | 5 | – 15.00 | 7.1 | – 46 | – 43.33 | .38 | – 96 | – 71.11 | .01 |
| 54 | 12.22 | 62.3 | 4 | – 15.56 | 6.8 | – 47 | – 44.89 | .35 | – 97 | – 71.67 | .01 |
| 53 | 11.67 | 60.0 | 3 | – 16.11 | 6.4 | – 48 | – 44.44 | .33 | – 98 | – 72.22 | .01 |
| 52 | 11.11 | 57.8 | 2 | – 16.67 | 6.1 | – 49 | – 45.00 | .31 | – 99 | – 72.78 | .01 |
| 51 | 10.56 | 55.7 | 1 | – 17.22 | 5.8 | – 50 | – 45.56 | .29 | – 100 | – 73.33 | .01 |
| 0 | – 17.78 | 5.5 | |||||||||