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 temperature of 19°C, while the coldest months are January and February, with an average of -3°C. The snowiest months in Gananoque are January, February, March and November, with each month seeing an average of 47 cm of snowfall.