Planning for the weather is an important factor for making your trip to Gananoque a success, especially when you’re splurging. The hottest months are usually July and August with an average temp of 66°F, while the coldest months are January and February with an average of 26°F. The snowiest months in Gananoque are January, February, March, and November, with each month seeing an average of 18 inches of snowfall.