What is the effect of Jinan winter "on" two long sentences at the beginning of the article?

At the beginning of this paper, the author compares Peiping, London and the tropics with his own personal experience, and writes the "miracle" and "strange thing" of Jinan's windless, foggy and drug-free days in winter, highlighting its "warmth" and praising Jinan as a "treasure land".

There are four sentences in this paragraph and three groups are compared.

In the first sentence, there is strong wind in Beiping almost every day in winter, but there is no strong wind in Jinan in winter. According to my own unique feelings, "it is a miracle not to blow in winter" makes the language vivid and sincere.

The second sentence compares the foggy winter in London with the clear and cloudless winter sky in Jinan.

The comparison of the third and fourth sentences into the weather. The author compares the tropical toxic days and very loud weather with the warm and sunny weather in Jinan in winter, thus highlighting the characteristics of Jinan's winter weather: warm and sunny.