The climate in Chengjiang is warm and temperate. Chengjiang County belongs to four climate types, namely, the middle subtropics, the north subtropics, the south temperate zone and the middle temperate zoneThis location is classified as Csa by Köppen and Geiger. The average annual temperature in Chengjiang is 17.1 °C. The rainfall here averages 981 mm.
The driest month is January, with 12 mm of rain. Most precipitation falls in July, with an average of 203 mm.
June is the warmest month of the year. The temperature in June averages 22.1 °C. In January, the average temperature is 10.1 °C. It is the lowest average temperature of the whole year.
There is a difference of 191 mm of precipitation between the driest and wettest months. The average temperatures vary during the year by 12.0 °C.