Planning for the weather is a good way to make your trip to Petrozavodsk relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 15°C, while the coldest months are January and February, with an average of -6°C. The snowiest months in Petrozavodsk are January, February, March and December, with each month seeing an average of 220 cm of snowfall.