If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Copper Mountain: The hottest months are usually July and August with an average temp of 49°F, while the coldest months are January and December with an average of 13°F. The snowiest months in Copper Mountain are March, February, January, and December, with each month seeing an average of 32 inches of snowfall.