The Idea

The only problem with this idea is: it doesn't really fit into any of the Science categories. But I'm interested to find out the answer!

The situation: There was a recent newspaper article about a 3 year old Malaysian girl who died after her father had forgotten about her and left her sleeping in the car. The car was locked and windows were wound up. The car was parked under the blazing hot sun. By the time he remembered about her more than an hour later, the girl had already suffered serious heatstroke.

Quite a lot of people don't know that leaving somebody in the car with no ventilation or air-con can actually cause a person to die if it is hot enough outside. This is not the first time something like that has happened.
 (Actually, even with air-con on you can still die from carbon monoxide poisoning, but that's a different story)

Hence, I would like to find out: just how high can the temperature in the car get in comparison to outside temperature, and how long does it take to reach such a temperature? It must be in comparison to the outside temperature, because although Singapore's temperature is constant (equatorial region), there can still be slight fluctuation on different days.

Do different coloured cars affect the the time taken to reach this temperature? (e.g. darker coloured cars, orange etc.)

Do different location affect the time taken to reach this temperature? e.g. In a basement carpark, under a large tree, in an open area under hot sun.

Note: A person's internal body temperature reaches 40-44 degrees when he has heatstroke.