If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Yuanshan: The hottest months are usually July and August with an average temp of 82°F, while the coldest months are January and February with an average of 63°F. The rainiest months in Yuanshan are October, November, September, and December, with each month seeing an average of 11 inches of rainfall.