I pull mine and store them in the garage on a shelf on a dual bank battery tender.
Extreme heat and cold are battery killers. That's all you need to know with batteries. Do with it what you will.... lol
My brothers shop does more auto battery replacements in February and august than anytime of the year. He just ordered a bulk of Interstates for his shop 3 days ago for the upcoming rush.
Batteries are expensive and can cause major problems. It's worth it to pull them and store them correctly on a trickle. But that's my take...