[McGruff]

I'm no Rocket Sceinitist but if you fill a ball at room temperature then take it out on the playing field naturally it's going to deflate some at lower temperatures.

[catfish1957]

V1P1/T1 = V2P2/T2

Yep, just like our tires in cold weather

[catfish1957]

it's going to deflate some at lower temperatures

No deflation, just lower pressure. Good example are tires at 70 mave have a tire pressure of 35 psi, but may drop to 25 PSI when the temperature is at 0. That same tire will pressure back up, when the temperature rises.