The weather in Jieyang city, Guangdong province tomorrow

According to the weather phenomena on 19 and 20th in the table, 19 is sunny during the day and cloudy at night on 20th. Compared with the 20th, the maximum temperature on 19 is higher and the minimum temperature is lower, which is because the atmospheric weakening effect during the day and the atmospheric reverse radiation at night on 19 are weaker than those on the 20th.

Therefore, choose: B.