If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Copper Mountain: The hottest months are usually July and August, with an average temperature of 9°C, while the coldest months are January and December, with an average of -11°C. The snowiest months in Copper Mountain are March, February, January and December, with each month seeing an average of 82 cm of snowfall.