Leaving your laptop in a car
Whether it was winter or summer, your car is just not a place you should leave a laptop in.
Not because there is a risk of a robbery, but because of car temperature.
If it is summer, on hot day, temperature in your car might rise up to 70 degrees centigrade. This will cause most of laptop cases to melt, and TFT monitors to brake.
On the other side, if it is a cold day with temperature about 15 or 20 degrees below zero, there is a good chance of your monitor cracking. So you should be very careful leaving your laptop in a car. Fixing a monitor is expensive, and sometimes it is just cheaper to buy new laptop