squeaking suspension in cold weather

I've got a 93 Altima that makes alot of squeaking noises in the suspension when I go over any bumps but only when the weather is colder - below 50 degrees or so. In warmer weather no noise at all. Any theories?

join the club, the upper strut bushings shrink in the cold and expand in the heat. it jiggles/squeaks when its cold because it shrinks.