Other facts from our historical weather data: Which is the warmest month in Healy? July has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Healy? The coldest month is January with an average maximum temperature of -15°C (5°F). Which is the wettest month in Healy? July tops the wettest month list with 111mm (4.4 in) of rainfall. Which is the driest month in Healy? March is the driest month with 20mm (0.8 in) of precipitation. 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.