If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Kemmerer: The hottest months are usually July and August with an average temp of 63°F, while the coldest months are January and December with an average of 20°F. The snowiest months in Kemmerer are April, November, December, and February, with each month seeing an average of 8 inches of snowfall.