Oh man this is a good one. I am not the most experienced
bird here but having recently rebuilt one heckuva lot of my
own 91 Civic's suspension, I'd go prowling around and poking
at the following, in no particular order:

--Broken front suspension springs. They tend to break at the
top or bottom, and it won't be obvious. IIRC the rubber
molded cap at the bottom can become worn with age, too.

-- Stabilizer bar links (they rust away really well after 15
years! Fortunately, they are easy to replace). They have a
lot of little bushings associated with them.

-- Radius rod bushings too old and fatigued to take load
properly (never heard of those causing problems, but they do
take a lot of force upon braking)

-- Lower control arm bushings. Get under the car (without it
jacked up and then with it jacked up) and inspect for
cracks, how the car sits with them. You can also measure the
height of the upper wheel well on both sides and possibly
get more ideas on the condition of these bushings.

"Guangzhou" <rjtrede@gmail.com> wrote
> Here's the weird "kicker"... The sound disappears as cold
> and rainy
> weather rolls in during the fall and early winter! After
> a few days of
> cold rainy weather, the sound gets quieter and quieter....
> and finally
> completely disappears until Spring! Just for the record,
> the car is
> parked every night in my garage, with is always a few
> degress above
> freezing.
>
> The car is still making noise this Autumn, because we have
> had
> beautiful warm 75 degree days so far... But just like the
> past 4
> years, I am certain the noise will go away and make no
> more noise until
> Spring, once we get a few cold rainy/snowy days... Then
> it will
> reappear in the Spring.
>
> The seasonal "appearance" and "disappearance" of the sound
> makes me
> think it could have something to do with the viscosity of
> a lubricant
> in some part (lubricant gets thick in winter and thins out
> again in the
> spring.) ... Or it could be a rubber bushing at fault
> which gets
> "stiff" in the winter and "spoungy" again when the warmer
> weather of
> the spring returns.
>
> Any ideas? Has anyone experienced the same thing? The
> sound is not
> only very irritating, but gives me "safefy concerns" as
> well.
>
> The car has "only" 140k miles on it and is otherwise in
> above average
> condition.

Yabut it has a lot of winter driving on it, no?