Other facts from our historical weather data: When is the rainy season in Zellberg? Rainy season in Zellberg occurs in the months of May, June, July and August. When is winter in Zellberg? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Zellberg? August has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in Zellberg? The coldest month is January with an average maximum temperature of -1°C (30°F). Which is the wettest month in Zellberg? June tops the wettest month list with 205mm (8.1 in) of rainfall. Which is the driest month in Zellberg? January is the driest month with 89mm (3.5 in) of precipitation. Which is the sunniest month in Zellberg? May is the sunniest month with an average of 185 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.