Moondog55 wrote:OK At that temperature there will still be moisture in the air so it will feel colder and that does explain some things.
Definitely, 91% humidity and with those lows the temperature would absolutely feel colder.
Similar to our mountains. The high humidity always makes me feel about 5 degrees colder than it is.
A decent summary.A question often asked is, "What's the effect of humidity in cold weather?" According to most books, having a higher humidity makes our body evaporate less water, resulting in less cooling. If that theory is extrapolated to very cool conditions, it would say that a cold and moist atmosphere would result in a person not being as miserable as if it were a cold, dry atmosphere. But it is not so. The reason is that people wear clothing. To an unclothed person, it is probably correct that in the humid atmosphere you would not be as cold as in the dry atmosphere. But we wear clothing. Often, as the humidity in the air increases, the insulating value of clothing decreases because of the moisture captured on the fibers of the clothing. This is the wicking effect of moisture in clothing. It can greatly accelerate the heat loss through clothing. Even though the clothes do not appear wet, the humidity in the air may create a thin layer of moisture on the fibers and result in greater conduction, or transfer, of heat through the clothing.
The person who says, "The coldest I have ever been was that cold, windy day when the humidity was so high," probably is telling the truth. It probably is realistic that it was because of the humidity reducing the insulating value of the clothing rather than the direct humidity effect on heat transfer from a person if they were unclothed.