When is the hottest time in a day?

12, the solar radiation is the strongest and the ground heat gain is the fastest, but the ground temperature is not the highest.

In the afternoon 1, because the ground radiation is the same as the solar radiation, the ground temperature reaches the highest.

In the afternoon 1, the ground temperature is the highest, and the power of transferring heat from the ground to the atmosphere is the highest, but the atmospheric temperature is not the highest. At 2 pm, the ground radiation decreased to the same degree as the atmospheric inverse radiation, and the atmospheric temperature reached the maximum.

In short, the solar radiation obtained from the ground is the strongest at 12;

The highest ground temperature is1in the afternoon;

The temperature is the highest at two in the afternoon.