Other facts from our historical weather data: Does Yellowknife have a dry season? Yes, the months of January, February, March, April and December are very dry. Which is the warmest month in Yellowknife? July has an average maximum temperature of 21°C (70°F) and is the warmest month of the year. Which is the coldest month in Yellowknife? The coldest month is January with an average maximum temperature of -21°C (-6°F). Which is the wettest month in Yellowknife? August tops the wettest month list with 51mm (2 in) of rainfall. Which is the driest month in Yellowknife? February is the driest month with 12mm (0.5 in) of precipitation. Which is the sunniest month in Yellowknife? June is the sunniest month with an average of 373 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.