I don't have a sidewalk out here. So I used a black cast iron skillet.
I checked the remote thermometer we have that sits outside and broadcasts the temperature to a receiver we have inside our house. It said it was 108 degrees outdoors. That's in the shade, too, because we keep this thermometer in an old bird house.
But then I took the thermometer to the fishing pier, in the sunlight, and got a different reading.
Then I got my laser-beam thermometer and pointed at the black skillet I set on the fishing pier:
I am not making this up. These are scientific instruments and you can't fool a scientific instruments.
So, the only thing missing in this experiment was a bunch of kids. Fortunately, we have new neighbors and it's like I had custom-ordered them. Rachel is three years old.
And she brought her brother and two sisters. And then the goats followed them over. The geese and duck, who thinks he's a goose, started to follow but I guess they're not as attached to the kids as the goats are. The goats always come over when the kids do.
So, back to the egg:
I went back out after about an hour. The egg white looked definitely "cooked" but the yellow had broken and made a big mess. I decided to bring the whole thing inside but the handle was too hot to touch without a hot pad.
Conclusion: It is hot.