Why is it so cold?

The change of temperature is mainly influenced by the change of sun height at noon and the length of day and night.

The changes in winter and summer are caused by the existence of the angle of intersection between the yellow and the red, and the changes of the two elements in the world at different times during the revolution of the earth.

At different latitudes, even in the same hemisphere, the sun's height is different at the same time, and the temperature is of course different.

But in winter, the temperature in China is much lower than that in western Europe at the same latitude, mainly because:

1, sea-land difference. In the ocean, the temperature difference between winter and summer is low because of the slow heat absorption and heat release.

2. Snow-covered Siberia (reflecting sunlight and reducing ground absorption) forms an extremely low temperature zone, and the "cold air" it blows seriously affects the winter temperature in China. We can see that the temperature has risen after the cold air.