The same ball when it's 100 degrees outside. Several past posts on this topic including a real good one from Titleist about sticking with your same ball year round. All balls will be affected a bit by temperature and elevation. You just need to adjust accordingly. You won't see the pros changing balls seasonally.

One that won't break the ice on the pond when I come up short.

Ditto on Dale's post. I play the Prov1 the year round. Temperature does not affect their performance.