Planning for the weather is a good way to make your trip to Viitasaari relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 14°C, while the coldest months are January and February, with an average of -6°C. The snowiest months in Viitasaari are January, February, December and March, with each month seeing an average of 214 cm of snowfall.