Planning for the weather is an important factor for making your trip to Tromsø a success, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 10°C, while the coldest months are January and February, with an average of -6°C. The snowiest months in Tromsø are February, January, November and December, with each month seeing an average of 58 cm of snowfall.