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nativenerd
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BEST ANSWER  decided by votes   |  nativenerd  |  June 23, 2009 03:44 AM  |  view on twitter
Most weather stations will include it. However, here's the formula if your interested:
http://www.weatherimages.org/graphics/heatdx.gif

where:

HI = Heat Index
T = Temperature (° F)
RH = Relative Humidity (%)

http://www.weatherimages.org/data/heatindex.html
Has both charts where you can look it up, or a form where you can input the temp and humidity and it will calculate it for you.

Voted as best: matthewh, buddawiggi
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