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 15°C, while the coldest months are January and February, with an average of -6°C. The snowiest months in Florissant are March, February, December and November, with each month seeing an average of 26 cm of snowfall.