Why are there many cold air masses in Siberia?

First of all, it has a high latitude and is located in the largest Eurasia. In winter, the ground temperature drops rapidly, thus forming a powerful Siberian high.

When the cold air mass moves southward to another area, it will not only cool this area, but also increase the direct temperature reduction rate due to the warming of the bottom of the air mass, and the air layer tends to be unstable, which is conducive to the development of convection and produces unstable weather, and the visibility at the lower level is generally good. In winter and spring, due to the low humidity in the cold air mass, it is often dry and cold weather; In summer, if there is a lot of water vapor in the cold air mass, cumulonimbus and cumulonimbus will often form, resulting in thunderstorm weather.

Cold air masses emphasize relative temperature. Sometimes, even if its temperature is higher, it is still a cold air mass as long as it is lower than the ground temperature.

The cold air masses active in China are mostly formed in the polar regions and Siberia.