I am leaning towards interior because it is inside the car.
You want a section just for trunk questions?
54F up here today. Clear skys so down to 36F before dawn. I'm a couple of hundred miles north of your relatives and close to the North Sea which is not known as warm water even in the summer. So we are usually a couple of degrees cooler than the south.
Without global warming it should still be snowing this time of year.
PS.
You should never ask an Englishman about the weather. We can go on about it all day.
