Why is it cold in Dongguan recently?

First, the earth is far from the sun in winter.

Second, the sunshine time in winter is short.

These two reasons lead to cold in winter.

In addition, winter is the period with the smallest solar altitude angle and the shortest daytime in a year. In summer, the height angle of the sun is the largest, and the day is the longest in a year. The main reason is that the strong cold air in the north has been going south recently, which has caused a large area of rain and snow in the country, making the temperature in most parts of the country 2~3 degrees lower than normal.