Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Heat Index vs. Humidity

The influence of humidity on the apparent temperature and the heat index.

Sponsored Links

The Heat Index - or the Apparent Temperature - is used to indicate how hot it feels when relative humidity is combined with temperature.

With increased humidity it feels hotter as indicated in the Heat Index table bellow:

Heat Index
Dry Temperature
 
Relative Humidity (%)
(oF)(oC)0102030405060708090100
70 21.1 64 65 66 67 68 69 70 70 71 71 72
75 23.9 69 70 72 73 74 75 76 77 78 79 80
80 26.7 73 75 77 78 79 81 82 85 86 88 91
85 29.4 78 80 82 84 86 88 90 93 97 102 108
90 32.2 83 85 87 90 93 96 100 106 113 122  
95 35 87 90 93 96 101 107 114 124 136    
100 37.8 91 95 99 104 110 120 132 144      
105 40.6 95 100 105 113 123 135 149        
110 43.3 99 105 112 123 137 150          
115 46.1 103 111 120 135 151            
120 48.9 107 116 130 148              

Heat and Humidity Index Danger Zones

  • 90 - 104 : Heat cramps or heat exhaustion possible
  • 105 - 130 : Heat cramps or heat exhaustion likely, heatstroke possible
  • 130 and more : Heat stroke highly likely

Example - Apparent Temperature

From the table - with dry temperature 85 oF and relative humidity 80% - the apparent temperature - or Heat Index - is 97 oF.

heat and humidity index danger zones

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2009). Heat Index vs. Humidity. [online] Available at: https://www.engineeringtoolbox.com/heat-humidity-factor-d_1505.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

3 10

Sponsored Links
.