Planning for the weather is a good way to make your trip to Havre relaxing and enjoyable, 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 February and January, with an average of -4°C. The snowiest months in Havre are January, March, February and October, with each month seeing an average of 24 cm of snowfall.