This is a great Q&A about leaving your devices in your car during a range of temperatures. Whitson Gordon provides very good advice on how to handle your portable electronic devices. We have been telling our clients this for years.
The best piece of advice “Lastly, if for some reason you do expose your gadget to extreme temperatures, don’t try to use it right away. Instead, let it warm up or cool down to room temperature before you turn it on. This will help protect your gadget from more lasting damage from things like condensation. In general, just use common sense: if your computer feels particularly cold or hot to the touch before it’s even on, you probably shouldn’t leave it alone in that weather.”