Answer:
Due to difference in angle.
Step-by-step explanation:
Irregularities in the temperature cycle are caused by the difference in angle of the sun. The angle of the sun is directly related to the intensity of the solar radiation. If the angle of the sun is at 90 degree so the intensity of the solar radiation is at maximum which leads to high temperature while on the other hand, at the sunset and at the sun rise the angle is lower than 90 degree which leads to lower intensity of the sun and also lower in temperature.