Other facts from our historical weather data: Which is the warmest month in Yoho National Park? 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 Yoho National Park? The coldest month is December with an average maximum temperature of -11°C (12°F). Which is the wettest month in Yoho National Park? June tops the wettest month list with 117mm (4.6 in) of rainfall. Which is the driest month in Yoho National Park? February is the driest month with 54mm (2.1 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.