Planning for the weather is a good way to make your trip to Blackhawk relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 21°C, while the coldest months are February and January, with an average of -2°C. The snowiest months in Blackhawk are April, March, February and December, with each month seeing an average of 17 cm of snowfall.