Weather is probably a major factor when you plan your trip to Ross River, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and June, with an average temperature of 11°C, while the coldest months are January and February, with an average of -15°C. The snowiest months in Ross River are January, November, December and February, with each month seeing an average of 35 cm of snowfall.