Other facts from our historical weather data: When is winter in Unternberg? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Unternberg? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Unternberg? The coldest month is January with an average maximum temperature of -1°C (30°F). Which is the wettest month in Unternberg? June tops the wettest month list with 152mm (6 in) of rainfall. Which is the driest month in Unternberg? January is the driest month with 65mm (2.6 in) of precipitation. Which is the sunniest month in Unternberg? July is the sunniest month with an average of 210 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.