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 Rumford: The hottest months are usually July and August, with an average temperature of 18°C, while the coldest months are January and February, with an average of -5°C. The snowiest months in Rumford are January, April, March and December, with each month seeing an average of 31 cm of snowfall.