Brian, if you plan on playing often, there is cold weather springs, they can help some, expansion chambers can help, ect. i suggest you try not to play below 32 degrees, because (like buddah said) your marker can malfunction and paint can get pretty screwed up...Your paint will get messy, but the gun doesnt always get messed, but the coldness of the air and the liquid co2 getting in your marker just screws things up
good luck!