Why is it not very cold in Beijing after the National Day holiday in early October?

The overall temperature in the same period in different years is different, often because of the different weather processes in this period. In the Beijing area, mid- or early September is often accompanied by a decisive autumn rain, bringing Beijing into autumn in the meteorological sense. Autumn in Beijing lasts from the beginning of autumn to late October. It lasts just over a month and is the transition period from summer to winter. During this period, the activity of cold air becomes more and more frequent and intense, and the temperature fluctuates, often hot and cold. You mentioned that the temperature in Beijing in early October in previous years was relatively high. This may be because Beijing was always controlled by a warm air mass and the temperature was relatively high, or perhaps there was a cold front before and the temperature returned quickly due to solar radiation after the passage of the cold front. The great cooling in recent years may be due to the intrusion of cold air at this time. The weather characteristics during this period are like this. There is no fixed time when the weather is colder or warmer, it all depends on the arrival time of the cold air.