Smartphones and tablets don’t like cold weather. When a lithium-ion battery is exposed to low temperatures, it can drain faster than normal or indicate it has ample power remaining and then suddenly go dead. Low temperatures can also make a device’s glass surfaces more sensitive to cracks and breaks, especially if there’s already a nick.
To protect your devices, don’t leave them for long in a parked car. Instead, take them with you, either in a clothing pocket or insulated bag. In the event your device does shut down, don’t restart it until it’s had time to warm up — restarting immediately could actually cause more harm and shorten the battery life.