Expansion / Contraction of Ice
I did a little browsing on the subject. Everything I found says about the same thing: Liquid water @0°C has a density of about 1.0 g/cc, while ice @0°C has a density of 0.92 g/cc. (Devitg: this is what breaks pipes). Once frozen, ice behaves like a typical solid, with a near-linear contraction per unit temperature drop.
I found a site that listed the thermal expansion coefficient of ice, but I lost the address before I could pos there. Sorry.