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 Avon: The hottest months are usually July and August, with an average temperature of 14°C, while the coldest months are January and December, with an average of -7°C. The snowiest months in Avon are March, January, February and April, with each month seeing an average of 21 cm of snowfall.