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 Campton: The hottest months are usually July and August, with an average temperature of 15°C, while the coldest months are January and February, with an average of -8°C. The snowiest months in Campton are January, March, April and November, with each month seeing an average of 42 cm of snowfall.