081 Relative humidity and precipitation

Relative humidity from dry bulb and wet bulb depression
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
2195%90%83%79%77%72%67%
2496%91%84%80%78%74%69%
2796%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%
3296%93%89%85%81%78%74%
3596%93%89%85%82%79%75%
3896%93%89%86%83%80%76%
Heat index as an effective temperature in °C given a dry bulb temp. and Rel. Hum.
Dry bulb temperature in °C
Relative humidity 2124272829313235
60% 21242829.5 32 35 38 46
70%21252930.7 34 37 41 51
80%22263032.1 36 40 4558
90%22263133.7 39 43 50
100%22273335.6 42
Effective temperature in °C:Risk level
Less than 32 °CLow risk
32 °C to 41 °C Heat cramps or heat exhaustion likely
Above 41 °CHeat stroke likely.