Guangzhou is located on the subtropical coast, with the Tropic of Cancer passing through the south-central part. It has a maritime subtropical monsoon climate, characterized by warm and rainy weather, abundant light and heat, long summer and short frost period. The annual average temperature is 20-22 degrees Celsius, which is one of the big cities with the smallest annual average temperature difference. The hottest month of the year is July, with an average monthly temperature of 28.7℃. January is the most common month in Leng Yue, and the average monthly temperature is 9 ~ 16℃. The average relative humidity is 77%, and the annual rainfall in the urban area is about 1720mm. Throughout the year, the rainy season is from April to June, the weather is hot and typhoon-prone from July to September, the temperature is moderate in October, November and March, and the cool winter is from December to February.