Other facts from our historical weather data: When is winter in Orsa? The coldest season / winter is in the following months: January, February, November and December. Which is the warmest month in Orsa? 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 Orsa? The coldest month is February with an average maximum temperature of -2°C (28°F). Which is the wettest month in Orsa? August tops the wettest month list with 96mm (3.8 in) of rainfall. Which is the driest month in Orsa? March is the driest month with 40mm (1.6 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.