You might spend a lot of your holiday inside, but if you're planning to venture beyond the casino, taking a look at local weather data can help you. The hottest months are usually July and August, with an average temperature of 16°C, while the coldest months are December and February, with an average of -7°C. The snowiest months in Bozeman are February, January, March and April, with each month seeing an average of 36 cm of snowfall.