Web bulb depression in °C: Dry bulb minus the wet bulb | |||||||
---|---|---|---|---|---|---|---|
Dry bulb T in °C | 0.5 | 1.0 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 |
21 | 95% | 90% | 83% | 79% | 77% | 72% | 67% |
24 | 96% | 91% | 84% | 80% | 78% | 74% | 69% |
27 | 96% | 91% | 85% | 81% | 78% | 75% | 71% |
28 | 96% | 93% | 85% | 82% | 78% | 75% | 72% |
29 | 96% | 93% | 88% | 84% | 80% | 76% | 73% |
30 | 96% | 93% | 86% | 82% | 79% | 76% | 73% |
32 | 96% | 93% | 89% | 85% | 81% | 78% | 74% |
35 | 96% | 93% | 89% | 85% | 82% | 79% | 75% |
38 | 96% | 93% | 89% | 86% | 83% | 80% | 76% |
Dry bulb temperature in °C | ||||||||
---|---|---|---|---|---|---|---|---|
Relative humidity | 21 | 24 | 27 | 28 | 29 | 31 | 32 | 35 |
60% | 21 | 24 | 28 | 29.5 | 32 | 35 | 38 | 46 |
70% | 21 | 25 | 29 | 30.7 | 34 | 37 | 41 | 51 |
80% | 22 | 26 | 30 | 32.1 | 36 | 40 | 45 | 58 |
90% | 22 | 26 | 31 | 33.7 | 39 | 43 | 50 | |
100% | 22 | 27 | 33 | 35.6 | 42 |
Effective temperature in °C: | Risk level |
---|---|
Less than 32 °C | Low risk |
32 °C to 41 °C | Heat cramps or heat exhaustion likely |
Above 41 °C | Heat stroke likely. |