Measure with a probe thermometer the surface temperature in the shade of various objects.
Write down the temperature for each object and the time it was measured.
Set each out so that the largest portion is facing directly into the sunshine. Do not place them on a metal table or concrete driveway, as this will affect the temperature. A grass lawn has air circulating through it, which moderates the temperature.
Remeasure the temperature of each object every 15 minutes, four times. Write down the temperatures and the times under each object on the list.
Subtract the first temperature measurement from the last to calculate the rise in temperature that 60 minutes in the direct sunlight made.
Draw conclusions from the data as to what types of materials have the greatest rise in temperature from the sun.