Why is the temperature difference between Wendeng and Rushan in Weihai, Shandong Province several degrees?

Why is the temperature difference between Wendeng and Rushan in Weihai, Shandong? Because the geographical environment is very different, except the latitude and longitude are slightly different, Kunyu Mountain, the roof of Jiaodong, has made a great natural barrier for Wendeng in the northwest, and Wendeng is very different between the east and the west. There is a huge snow belt about 30 to 40 miles southeast of Wendeng. It can be seen from the weather forecast of the Central Meteorological Observatory that it often doesn't rain or snow in the north. It's just a corner of Yantai Weihai where there is rain and snow every day. Because there is much wind in the northwest, there is much rain and snow in the east of Wendeng. Before climbing the mountain, there is almost no heavy snow in winter, or even little snow, which is blocked by the mountains in the north, which leads to different temperatures and, of course, different marine climate.