Its not your imagination. A very cold ball will be harder which means it will skid more and deflect more when it hits the pins. A very hot ball will be softer and will "burn up" sooner and roll out. That's not to mention the problems you're going to have with the size of your thumb and finger holes.
But its not as simple as that. The cold ball isn't going to stay cold. So even if you adjusted for the harder surface and looser holes, that ball is going to slowly adjust to room temp so you'll have to constantly adjust how you throw it and remove
tape.
It's got to be tough in the summer especially to try and keep a consistent temp with the extreme differences between heat outdoors and A/C indoors, but what I'll try to do is see how my local center handles the heat. If they have a lot of A/C I'll keep my ball in the house where I'll have A/C on and in the back seat with A/C in the car on the way to the center. If on the other hand the lanes are pretty warm, then I don't know what to do...I wouldn't want to leave it in the car. Maybe I'll keep it indoors and put it out on the back porch an hour or so before I bowl to let it adjust temp.
What do you wiley verterans do in the summer?
<EDIT> Besides spell wily and veterans correctly </EDIT>
Chris