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Old 08-18-2013, 08:04 PM
 
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A place like Astoria, OR (and probably other areas at or near the OR/WA coasts) has surprisingly high dew points in the mostly dry summer months, particularly as it rises with the temps in the afternoons. In Astoria's case, DPs don't seem to get much beyond the lower 60's at the Astoria Airport, but tack about 2 miles to the NE to the Astoria peninsula itself (i.e. away from the Pacific), and monitoring stations there consistently find DPs eventually reaching well into the 60's and even lower 70's sometimes, even on days when it's the very same temp at the airport.

I was in Astoria on Friday, and in the sunny afternoon the temp and the DP rose into the lower 70’s, the latter of which makes me think Florida or New England. But while I perceived that the air was heavy, I wasn’t uncomfortable even though I wore a jacket (I wasn’t sure what kind of weather to expect) and walked all over the place, including many hills. If anything, it was the sun that was more bothersome than the air, and I found it to be very nice in the shade.

Anyway, this is puzzling to me, and the only thing that I can figure is that it was because of the sea breeze and the fact that it wasn’t a 90 degree day (though that can happen there).

Is the fact that it's almost always cool its saving grace? Because anywhere else I've been, a DP of 70 is very unpleasant.
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Old 08-18-2013, 08:29 PM
 
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Only matters if the dew points are accompanied with a temperature above 80F/27C. Then it's possible for a heat index to be produced. Anything temperature below doesn't really have a significant "real feel" on the human body.
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Old 08-18-2013, 08:39 PM
 
Location: Miami,FL
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Quote:
Originally Posted by chicagogeorge View Post
Only matters if the dew points are accompanied with a temperature above 80F/27C. Then it's possible for a heat index to be produced. Anything temperature below doesn't really have a significant "real feel" on the human body.
actually if the temperature is below 65 then high humidity actually causes your body to feel colder then if it weren't humid
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Old 08-18-2013, 10:01 PM
 
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^^

True, but I think the more significant impact on the body would be much more pronounced in heat.

I will say that when I went to New Orleans last January, it felt quite chilly. It was unseasonably cold for the location with temps in the 50's, but a strong damp wind made it bite.

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Old 08-18-2013, 11:03 PM
 
Location: Top of the South, NZ
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Originally Posted by miamihurricane555 View Post
actually if the temperature is below 65 then high humidity actually causes your body to feel colder then if it weren't humid
I don't think that is correct. Do you have any links supporting that view?
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Old 08-19-2013, 03:26 PM
 
13 posts, read 37,992 times
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Thanks everyone. The chart in F:

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Old 08-19-2013, 03:41 PM
 
Location: Miami,FL
2,892 posts, read 3,093,047 times
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Originally Posted by Joe90 View Post
I don't think that is correct. Do you have any links supporting that view?
yep here you go.Why Does Humidity Make You Feel Colder In Lower Temperatures?
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Old 08-19-2013, 04:09 PM
 
Location: Leeds, UK
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We had a temp of 24C with a dew of 21C not long ago and it definitely felt a lot more oppresive to me than 24C with dews around 10 - 15C. The air felt thicker to breath, if that makes sense. It's kind of hard to explain - hot isn't the right word, just muggy.
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Old 08-19-2013, 04:32 PM
 
Location: Mid Atlantic USA
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Quote:
Originally Posted by miamihurricane555 View Post

But that article doesn't give a temperature threshold for what is considered a "cool, damp day". How did you come up with 65F?
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Old 08-19-2013, 07:35 PM
 
Location: Top of the South, NZ
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Originally Posted by miamihurricane555 View Post
That doesn't explain anything at all. High humidity is common without rainfall. And as for sweat on a cool day, why are you sweating more in the first place? - because you cool at a slower rate, if it's higher humidity (so more sweat). The wet through sweat theory doesn't really hold up either. It's about 15C/59F and 87% RH, with steady moderate rain at present and I don't feel like I've got wet/damp clothes.
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