Other facts from our historical weather data: Which is the warmest month in Plagne 1800? 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 Plagne 1800? The coldest month is January with an average maximum temperature of -3°C (27°F). Which is the wettest month in Plagne 1800? December tops the wettest month list with 150mm (5.9 in) of rainfall. Which is the driest month in Plagne 1800? August is the driest month with 104mm (4.1 in) of precipitation. Which is the sunniest month in Plagne 1800? July is the sunniest month with an average of 275 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.