The question pretty much sums it up. How TF is the asphalt 20-40° hotter than the air when it’s super hot?
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Imagine opening the oven door and getting hit with a wave of heat, this heat doesn’t make your face instantly get up to hundreds of degrees. Being hit with a high temperature for a short duration will increase the temperature but it won’t completely finish hearing it.
Now imagine sticking a plate into the oven for several minutes, this will cause the plate to reach hundreds of degrees in the end.
A similar effect is happening to the asphalt, the sun is really hot, but hitting your skin for short durations will not cause it to get that hot because there are many things your body does to cool itself down. The asphalt however, does not. So it will keep absorbing more and more of the heat if it is in the sun for long periods of time.
P.s. dark things absorb more heat from the sun than light things. This is why asphalt(black) is typically much hotter than concrete(grey/white)
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