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Attic condensation Leak exhaust duct
Kenny I know yer used to breathing a lot of hot air-- ahem--, but cold air does have moisture in it just like hot air.
Right now it is 36 out and the humidity level is 89%. Last week here it was in the single digits and the humidity level was 99%.
You may be thinking of air density. But even then cold air is much, much denser. But that isn't related to moisture content.
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Attic condensation Leak exhaust duct
"Relatively Speaking …
Relative humidity (RH) is the percent of moisture actually in the air compared to the maximum amount of moisture the air can hold at that temperature. Cold air can hold less moisture than warm air. At 70ºF, air can hold as much as 12 times the amount of moisture as 10ºF air. That’s why it’s usually more humid in the hot summer months."
Ole Jeff the above quote is found at the link. The same is found in many post on the internet, NASA's was little too long to post.
But seriously you know winter air is dryer, that is why your skin has such a problem being dry and the large jump in sales of all kinds of creams. The fact cold air has 89% relative humidity could be 100% true but if the air was warmed that 89% would begin to drop as warmed. That is why as warm air goes out my exhaust pipe that is not insulated it sweats or condenses and drips into my house. Just think about where most rain (maybe all I don't know that) comes from. You have a warm air mass that meets a cold air mass. If the warm air mass has a high relative humidity you will have rain or snow. Of course warm air and cold air can be dry or full of moisture as it relates to their tempature.
Now HOT Air from Washington may be a different issue.
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Attic condensation Leak exhaust duct
Dennis, did you find the source of the "leak"?
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Attic condensation Leak exhaust duct
Update, still no more leaks from that fixture. Now convinced that the culprit was the fact that I have a central exhaust system fro all the bathrooms so a galvanized pipe runs across the attic ceiling above the three light fixtures.
At the time both of my kids would take very very very long hot showers. That must of caused the condensation in the attic.
Since then they have, with constant coaching from me, shortened the shower time 
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Attic condensation Leak exhaust duct
When we built we install large capacity exhaust fans in our bathrooms. We also used galvanize pipe and with two no issues. But the main bathroom the pipe was run straight up for a few feet. All was fine till we started getting water drops out of our fan. Took a little bit of thinking to realize it was the hot moisture laden air hitting the cold attic air and it really turn the moisture into rain. So we learned in the winter time it make good energy sense to not run the exhaust fan for steam removal. It was not just moisture on the inside of the pipe but it also was on the outside of the uninsulated pipe and that was staining out ceiling.
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01-15-2010, 16:59 
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