Hi Tommy, yes if it gets very cold in your garage it will affect the way the paints spray. Unless you have a way to warm them up (a bowl or small tupperware-type container with warm water in it for example). Also, if you are spraying in said garage, painting small parts with the cans may be okay, but complete bodies, etc. may be affected by the temperature as well. Humidity will also play a factor.
Just my two cents for what they are worth ?
Cheers