Moisture and humidity are your enemies. Rapid temperature change can induce the circumstances. But the majority of the time as long as you don’t have the back glass in the elements you will be fine. During significant temperature changes there is always the chance of inserts expanding and contracting at different rates than the wood play field. And thus resulting in loosening either up or down. I live in Vermont where winter in January and February are consistently below freezing. And yet I have purchased machines that have been in peoples uninsulated and unheated Garages for years with no apparent consequences. If you can protect it from the cold great, but if not I wouldn’t worry too much especially in your area.

Thanks
Blake