Weather is probably a major factor when you plan your trip to Mount Arlington, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 21°C, while the coldest months are January and February, with an average of 0°C. The snowiest months in Mount Arlington are January, February, March and April, with each month seeing an average of 14 cm of snowfall.