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Old 12-02-2014, 06:32 PM
 
Location: Sydney, Australia
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For example, 30C (86F) and a RH of 50%, is that considered humid heat? How high should the RH be for the hot weather to be considered humid?

Another question; Is there a grey area between dry & humid heat? Can it feel like both (or 'in between')?
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Old 12-02-2014, 06:39 PM
 
Location: Arundel, FL
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Heat is 80F and above, humid is when the dew point is 60F or above. I guess "humid heat" is when the temp is at least 80F, and dew point is at least 60F.
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Old 12-02-2014, 07:20 PM
 
Location: Lexington, KY
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At 30C I would say a dew point of 18-19C is a grey area where it's neither muggy nor uncomfortably dry.
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Old 12-02-2014, 07:25 PM
 
Location: Paris, ÃŽle-de-France, France
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Temperature above 80°F / Dew Point above 60°F

Quote:
Originally Posted by tommyFL View Post
Heat is 80F and above, humid is when the dew point is 60F or above. I guess "humid heat" is when the temp is at least 80F, and dew point is at least 60F.
Agreed.
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Old 12-02-2014, 07:59 PM
 
Location: MD
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I made a 'temps vs RH chart' for my own perspective on dry vs humid heat (it came out crappy since I made it in ~5 mins using MS Paint, but you'll get the point).

As the OP said, there should be a "gray area" surrounding the curve in which it may feel like dry heat or humid heat, depending on other factors.


Attached Thumbnails
What dewpoint/RH and temp combo is considered 'humid heat'?-dry_vs_humid.png  
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Old 12-02-2014, 09:55 PM
 
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For me the temp must be at least 80F/27C and the dew point 68F/20C to be considered "humid heat". At that temp and dew point a heat index of 83F/28C is produced. Nothing to get excited about but if a heat index isn't produced, then it's not really "humid heat" imo.


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Old 12-02-2014, 10:05 PM
 
Location: Castlederp
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That may be true, but 27C with a dew point of 15C certainly feels reasonably muggy and is about what the dew point would be here with a temperature of 27C. It certainly feels hotter or more muggy than a temperature of 27C and a dew point below 10C..

I think for me 80F and 60F is a reasonable assumption, but of course other people will have different tolerances to humidity
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Old 12-02-2014, 10:10 PM
 
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Quote:
Originally Posted by irlinit View Post
That may be true, but 27C with a dew point of 15C certainly feels reasonably muggy and is about what the dew point would be here with a temperature of 27C. It certainly feels hotter or more muggy than a temperature of 27C and a dew point below 10C..

I think for me 80F and 60F is a reasonable assumption, but of course other people will have different tolerances to humidity
You would never here a local forecaster ever calling 15C "muggy" here. That's still in the comfortable range. 16-18C is only starting to "get sticky"...

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Old 12-02-2014, 11:11 PM
 
Location: Paris, ÃŽle-de-France, France
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Quote:
Originally Posted by chicagogeorge View Post
For me the temp must be at least 80F/27C and the dew point 68F/20C to be considered "humid heat". At that temp and dew point a heat index of 83F/28C is produced. Nothing to get excited about but if a heat index isn't produced, then it's not really "humid heat" imo.

The chart shows 60°F dew point is the closest to maintain with the actual temperature which means neither dry or humid; very neutral.
At least we can say 50°F is getting lower and 65°F is getting higher.
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Old 12-03-2014, 12:45 AM
 
Location: Victoria, BC, Canada
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Quote:
Originally Posted by tommyFL View Post
Heat is 80F and above, humid is when the dew point is 60F or above. I guess "humid heat" is when the temp is at least 80F, and dew point is at least 60F.
I like it. Who am I to argue with the guy from Florida about heat and humidity?
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