As with all things wood, the temperature and humidity can have certain effects. Wood can and will expand, contract, bow, cup, twist, and warp. Short term exposure to changes in temperature and humidity flucuations shouldn't cause any issue. But if you were to lock one of our items in your car during a rainy day or during a sweltering heat wave, you may experience issues. Treat wood like it is a child. Very tempermental if you ignore it. In some cases, this wood movement can be reversed by returning it to a stable and comfortable environment. But not always.