Weather will likely play an important role when you plan your trip to Chenggong, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and June with an average temp of 68°F, while the coldest months are January and December with an average of 51°F. The rainiest months in Chenggong are June, July, August, and September, with each month seeing an average of 9 inches of rainfall.