Some wines will leak at fairly low temperatures. But the hotter the weather, the more likely that a particular bottle will leak. If you do not have a cool storage area, another possibility is to store the bottles upright during warm weather.
Whenever you carry wine in your car during warm weather months, it is best to keep the bottles in an upright position and keep them with you in the front of the car, not in the trunk. Also, do not leave them in a closed car which is parked in the sun. With excessive temperature, the wine and air inside the bottle will expand and possibly cause leakage of the wine past the cork.
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