Why does it get cold in winter?

The cold weather in winter is due to the seasonal changes of the earth and the influence of the revolution of the earth.

When the earth revolves to a position far away from the sun (that is, the winter solstice), the direct point of the sun is far away from the earth, and the energy of the direct sunlight is gradually weakened after being attenuated by the atmosphere, which leads to the decrease of the solar radiation energy received by the earth's surface, and thus the temperature drops. In addition, the change of continental climate and wind direction in the northern hemisphere in winter will also lead to the decrease of surface temperature.

In a word, the temperature change in winter is the result of many factors.