Other facts from our historical weather data: When is winter in Leadville? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Leadville? 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 Leadville? The coldest month is January with an average maximum temperature of -2°C (28°F). Which is the wettest month in Leadville? August tops the wettest month list with 64mm (2.5 in) of rainfall. Which is the driest month in Leadville? June is the driest month with 19mm (0.7 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.