Chongqing's climate belongs to subtropical monsoon humid climate, with hot summer and warm winter, wet and cloudy, high temperature, long rainy season, less frost and snow, cloudy days and high humidity. At the turn of spring and summer, it always rains at night and clears up during the day. This unique climate has created a poetic "late rain". Li Shangyin, a famous poet in the Tang Dynasty, wrote Notes for Northern Friends on a Rainy Night in Chongqing, which vividly described the climate characteristics of Chongqing on a rainy night. "When you ask about the untimely return date, late rain will rise in the autumn pool. Why do you want to cut the candle at the west window together, but talk about the rain at night? " Late rain has become a deeply yearning artistic conception and a symbol of Chongqing's poetic dwelling.