Joe, store my LiPo's in a non-temperature controlled attached garage year around. 100deg F summer. 26deg F winter. Near as I can tell, no negative impact. 'AC'
Hey Joe. You're not overthinking it. LiPos are not to be trusted. Your method of storage RE: ammo can/Fire extinguisher box should be o.k. sitting at storage charge for winter in your garage. I would discourage keeping them in the house. Doing a cycling charge with return to storage...