Does parking in the shade in the hot summer months make a difference for your car? Researchers in Phoenix tested the theory and found that cars in peak sun were significantly hotter than those in the shade. That’s obvious, but what’s interesting is that the sun-parked cars heated to temperatures that exceeded 160 degrees, which is when materials like car seats and dashboards can burn your skin. And when it came to cooling the interior of the car, a shaded car took just 12 minutes to cool down, while the car in the sun took 21 minutes. When it comes to long-term car parking, seek shade whenever possible.