Reasons for the small temperature difference in Harbin National Day.

Clouds at night enhance the atmospheric inverse radiation. Temperature difference refers to the difference between the high and low temperatures of an object. According to different averaging methods, it can be divided into arithmetic average temperature difference and logarithmic average temperature difference. Temperature difference has different applications in different disciplines, such as day-night temperature difference, ocean temperature difference, heat island intensity, noise equivalent temperature difference and so on. Temperature difference between day and night: within a period of time, the highest temperature and the lowest temperature are the temperature difference during this period.