You might spend a lot of your holiday inside, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are January and February, with an average of -4°C. The snowiest months in Riverton are April, November, February and January, with each month seeing an average of 27 cm of snowfall.