Beijing has four distinctive seasons. Like New York city, Beijing has hot summers, very cold winters, warm springs and cool autumns. Among these four seasons, the autumn is the best. From September to November, it is the fall in Beijing. The weather is neither cold nor hot. The average temperature is about 18 degrees centigrade. Starting from September, people can feel the pleasantly coolness of the fall. The sky is always clear. It is seldom windy, and it doesn't rain. October in Beijing is the most beautiful (season). October 1st is the Chinese National day. In order to celebrate National Day, People display a lot of flowers in streets. Beijing looks like a big garden. When November arrives, the leaves at Fragrant Hill turn red. People all go to see the autumn leaves there. Du Mu, a Tang Dynasty poet, once wrote a poetic line that reads "The frost-covered leaves are redder than the flowers of February ", lauding the leaves at this time as redder that the flowers in the spring. The fall in Beijing is also the best touring season. A lot of foreign friends come to vist Beijing. They can vist many famous sites such as the Forbidden City, Bei Hai Park, the Temple of Heaven etc. They can also see the newly-built highway and modern international airport. They can even taste Beijing's various unique local delicacies. Present Beijing is not only an ancient city, but also a rapidly developing modern city.