Other facts from our historical weather data: Which is the warmest month in Whitehorse? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Whitehorse? The coldest month is January with an average maximum temperature of -13°C (9°F). Which is the wettest month in Whitehorse? July tops the wettest month list with 61mm (2.4 in) of rainfall. Which is the driest month in Whitehorse? April is the driest month with 21mm (0.8 in) of precipitation. Which is the sunniest month in Whitehorse? June is the sunniest month with an average of 270 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.