As I am sure you know, the weather affects many things in shooting.  A cartridge left in the sun during the summer will build pressure adding another variable to the shot.  This is why so many precision shooters keep dope books (not that kind, dope means information in the shooting world) for every rifle that they have.  They want to know what bullet is going to do on a cold bore or a rifle that hasn’t been fired. Now that the weather is...