Why is it that the more inland in winter, the more windy days there are?

Obviously, from the distance of the source, the source of winter wind is closer to China, so the wind is stronger. Temperature difference and pressure gradient force The temperature difference between north and south in winter in our country is large, which leads to a large pressure difference, so the horizontal pressure gradient force is large, and the pressure gradient force is the main cause of wind, so there are often strong winds in winter in our country. The above list only lists some reasons, and the scope of application is limited to China. This question can also refer to the relevant knowledge of high school geography to analyze other reasons, and can also draw inferences about the reasons of winter gale in other areas.