The safe range for laptops is 50° to 95° Fahrenheit or 10° to 35° Celsius. For most of us, the winter months regularly dip way below that temperature. If your gear stays put inside the apartment,you don't have much to worry about—it's likely that you keep your thermostat set comfortably above that safe-range minimum for your own amenity.
But if you're out-and-about with your laptop, iPad or other tech on a regular basis, it's good to keep that safe range in mind. Although it's convenient, leaving your gear in the car or trunk during cold winter days definitely exposes it to temperatures outside the safe range. This could lead to permanent damage for your devices, like (literally) frozen hard drives and damage to screens, according to this winter gadget tips list from Geek Sugar.
To prevent any lasting damage, just be sure to keep your gear out of the cold car. If you've got your laptop with you and need to run an errand, take it with you. It's better for your gear and for your safety.