Guangzhou City is located in subtropical coastal region, and the Tropic of Cancer runs through its central and southern parts. Due to this, Guangzhou City belongs to marine subtropical monsoon climate, which features warm weather, plenty of precipitating, sufficient sunshine, long summer, and short frost period. In Guangzhou City, the mean temperature all year round is 20-22℃, with mean relative humidity of 77% and annual precipitation of 1,720mm. Normally, the rainy season in Guangzhou lasts from April to June, but weather from July to September is hot and of frequent typhoons. Temperature in October, November, and March is moderate, and the cold winter lasts from December to February of the next year.