Why is the temperature difference so big in winter?

Large temperature difference between north and south in winter: The farther north the northern hemisphere is in winter, the smaller the solar altitude angle, the shorter the day and the longer the night. Therefore, compared with the north, the south not only has a large solar altitude angle, but also has a long sunshine time, obtains more heat and has a much higher temperature than the north; At the same time, the northern region is easily affected by the cold air from Mongolia and Siberia in winter, and the cold air will gradually weaken in the process of going south, and the cold wave in the south has less influence than that in the north. These two factors lead to a great temperature difference between north and south in winter.

The temperature difference between north and south is small in summer: in summer, the solar altitude angle in the northern hemisphere (north of the Tropic of Cancer) is generally large (although it is still small at higher latitudes), and the daytime time at high latitudes is longer. The sun's altitude angle in the north is smaller than that in the south, but the sunshine time is longer than that in the south. Generally speaking, there is little difference in heat between the north and the south. So the temperature difference between north and south is not obvious in summer! ! ! !