Weather can make or break a road trip, so here's some data about year-round temperatures in Whiteclay to help you plan yours: The hottest months are usually July and August, with an average temperature of 22°C, while the coldest months are February and January, with an average of -1°C. The snowiest months in Whiteclay are December, April, February and November, with each month seeing an average of 18 cm of snowfall.