If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Dushan County: The hottest months are usually August and July with an average temp of 73°F, while the coldest months are January and December with an average of 50°F. The rainiest months in Dushan County are June, May, July, and August, with each month seeing an average of 11 inches of rainfall.