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 Eagle River: The hottest months are usually July and June, with an average temperature of 13°C, while the coldest months are January and December, with an average of -8°C. The snowiest months in Eagle River are December, November, January and February, with each month seeing an average of 62 cm of snowfall.