Hi, Ms. Vyna. Febuary is still cold in China, but if you want to spend the Chinese New Year here, it would be a good idea. Well, keep warm. The average temperature in Feb in Beijing, 0-3C, about 5C in Xian, and about 7C in Shanghai. Yes, tours are operated all year round. Or you can visit these cities before Christmas? Generally speaking, the best time to visit Beijing and Xian is autumn. Hong Kong's climate is favorable in winter.