On 1/18/06 9:40 AM, "Chris Solliday" <solliday@ptd.net> wrote: > I'd like to revise my last reply to Alan, I'll stick with "will" because > here when the temperature rises around here in summer the humidity does > also. This does imply a rise in water vapor. I realize this is not what you > are addressing but it is what I was saying. I'll will try and be clearer > from herer. Nevertheless the site > http://ianrpubs.unl.edu/generalag/g828.htm#pc is very helpful and whether we > are concerned with pigpens or concert halls I think the info is well > presented. Chris Solliday It is true enough in certain climates (NE and midwest, for instance), that higher temps usually mean higher humidity, but this is not at all absolute. Partly that syndrome is the result of fairly extreme outdoor temperatures. When they are very low in the winter, much of the water vapor is removed from the air because cold air won't hold much. When that air (which, BTW, has a very low dew point) comes inside a building and is heated, the RH is going to be very low (unless moisture is added), probably much lower than summer. But climates may vary and cause the opposite to occur. Here in New Mexico, we do usually get a humid period in the late summer (July/August), due to seasonal afternoon showers. But before those arrive, in May and June, we can often have our very driest conditions, at very high temps (90 - 100F being common then). I have measured below 2% outside in June during one of our recent drought years. And there are places like, I believe, parts of southern California, where the summers are dry, and the winters are the rainy season. IOW, it ain't all that simple. Though it may be in PA <g>. Regards, Fred Sturm University of New Mexico
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