Is there a difference between Japanese seasonal climate and China? In which season is China in winter?

Compared with European and American countries, the weather in Japan and China still has some similarities. For example, the south is also rainy season, and typhoons often attack in summer and autumn. The most obvious difference is that Japan is surrounded by the sea, and its maritime climate is remarkable, which is slightly cooler in summer and warmer in winter than China at the same latitude. For example, Tokyo is 35 degrees north latitude, similar to Shandong and Henan, but the temperature in winter is above 0 degrees. The latitude of Hokkaido is the same as that of the northeast, and it is said that it is also very cold in winter. Actually, it's just heavy snow. According to China's standards, it's just about the same as the temperature in northern North China and much warmer than that in Northeast China. Judging from Japanese clothes, it is coldest in winter, so it is enough to wear a sweater on the upper body and a coat outside. However, winter in central and southern Japan is difficult. Rooms are generally not heated (central heating mode in the north), which is a bit like the south, and only air conditioners or gas stoves are used for heating. The most painful thing is girls, who are basically small skirts all year round, and they feel cold when they look at them.