If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Yima Subdistrict: The hottest months are usually July and August with an average temp of 84°F, while the coldest months are January and December with an average of 65°F. The rainiest months in Yima Subdistrict are August, July, June, and September, with each month seeing an average of 15 inches of rainfall.