Every morning in the summertime when I come outside to my Volt, where it is parked in the shade of the house, the windshield is clear and dry, and the rear hatchback glass (what do you call that? Rear windshield?) is covered in condensation. Why is that? Why is the front glass dry and the rear glass wet? This is the case every single morning, even before the sun is up. I'm mystified. It's bothering me! Can anybody explain this?