Weather is probably a major factor when you plan your trip to Yanggu, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 69°F, while the coldest months are January and December with an average of 27°F. The rainiest months in Yanggu are July, August, June, and September, with each month seeing an average of 9 inches of rainfall.