I found frost on the grass on our lawn in some of the lower areas yesterday.  This morning about 6:45 AM I went out to warm up the car and wipe off the condensation from the windows for my wife.  I was surprised to find that the top of the car had ice rather than dew.  The vehicle is black so could that be black hole radiation causing the freezing on the top of the vehicle?  Had that years ago in July on bottom ground.

The temp according to the thermometer was 34 but that was close to the house.   I know we turned on the furnace for an hour.