Reply
Thread Tools Display Modes
#1
Old 02-28-2003, 09:26 AM
Guest
Join Date: Feb 2003
Location: Tallahassee, FL
Posts: 5
Humidity & Cold Weather

A friend from Colorado moved to Florida a few years ago. He swears to me that a cold temperature feels colder in Florida than it felt in Colorado. Just as the humidity makes hot feel hotter, he says humidity makes cold feel colder.

I understand perfectly why humidity makes hot feel hotter, and I know that wind makes cold feel colder. But I've never heard any talk of humidity making cold feel colder.

Any info on this?

(Although I do know 70 degree air feels fine, but a 70 degree swimming pool is too cold!)

Thanks
#2
Old 02-28-2003, 09:45 AM
Guest
Join Date: Apr 1999
Location: Ohio
Posts: 10,489
According to this site,

Quote:
Cold air with high relative humidity “feels” colder than dry air of the same temperature because high humidity in cold weather increases the conduction of heat from the body.
#3
Old 02-28-2003, 09:53 AM
Guest
Join Date: Feb 2003
Location: Tallahassee, FL
Posts: 5
Great site, thanks.

I think I'm going to suggest the weathermen add "cold index" to the already existing "heat index" and "wind chill factor."
#4
Old 02-28-2003, 03:32 PM
ftg ftg is offline
Guest
Join Date: Feb 2001
Location: Not the PNW :-(
Posts: 16,014
OTOH, it is very generally regarded that increasing the humidity in a house during the cold of winter will make if feel warmer. See the last part here.
#5
Old 02-28-2003, 03:48 PM
Guest
Join Date: Apr 1999
Location: Ohio
Posts: 10,489
Humidifying your house in the winter is O.K. when you’re trying to increase comfort, but there is a drawback: it increases the water vapor pressure differential around the structure’s envelope (i.e. walls). In the winter (and only in cold climates), water vapor travels from inside your house to the outside. Under the right conditions condensation can form in one of the envelope layers, though this is usually a problem only when there’s a vapor barrier near the outside wall.
#6
Old 02-28-2003, 04:13 PM
Guest
Join Date: Feb 2003
Location: Tallahassee, FL
Posts: 5
I just read some info at the MadSci Network re: relative vs. absolute humidity. It may have something to do with that, but I admit that's getting above my head.

If it's humid enough to actually form condensed water on your skin, then you would feel colder, and when the wind blew you would *really* feel it.
#7
Old 02-28-2003, 05:44 PM
Guest
Join Date: Apr 1999
Location: Ohio
Posts: 10,489
News flash: My earlier post was incorrect. And the quote from the link is wrong. The thermal conductivity of air actually decreases as its relative humidity increases. According to my 2001 copy of the ASHRAE Handbook, 20°C/20% RH air has a thermal conductivity of about 0.025 Wm-1K-1, while 20°C/80% RH air has a thermal conductivity of about 0.020 Wm-1K-1, which is 20% lower.This link provides a much better explanation of what’s going on.
#8
Old 02-28-2003, 06:10 PM
Guest
Join Date: Dec 2002
Location: colorado
Posts: 678
Is this thread also about monkeys?
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 12:35 AM.

Copyright © 2017
Best Topics: doublju wiki tony danza shirtless real marshmallows heroin message boards 120mb data dragonskin bulletproof vest kosher shrimps parrots and pirates colymbosathon ecplecticos pyramid capacitors 70's braless computer sex game smooth cigarettes scandal message board melting a penny cinemax actresses gallon of vodka purpose of washers illyria angel neosporin in nose lost house keys fiat lease 99 instant stooge dragon skin vest programmable thermostat boiler the maxx iz gor movie sony acid loops crystal light popsicles extremely dry nose prn meaning job i keep smelling poop using oven to heat home how to make gardenia bloom what do i call my cousin's child short run t shirts benefits of rooting fire tv stick salsa mild vs medium lug nuts won't come off did elvis write any songs how long is a coon's age registered mail vs certified mail is there ammonia in urine snake skin body armor how to appeal a restraining order what does on center mean how to sand drywall fast pot roast internal temperature can sororities have parties in their houses my cat wants to go outside all the time vanilla extract have alcohol go over one's head sae 5w-30 vs 5w-30 50 thou a year will buy a lot of beer ifs and buts were candy and nuts simpsons car idles up and down when stopped we all live in a yellow coupe deville steel door frames residential what does oz stand for knox gelatin drug test nissan altima usb port not working long denim skirts religion