Other facts from our historical weather data: When is the rainy season in Niederhart? Rainy season in Niederhart occurs in the months of May, June, July, August and September. When is winter in Niederhart? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Niederhart? August has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Niederhart? The coldest month is January with an average maximum temperature of -0°C (32°F). Which is the wettest month in Niederhart? June tops the wettest month list with 216mm (8.5 in) of rainfall. Which is the driest month in Niederhart? January is the driest month with 94mm (3.7 in) of precipitation. Which is the sunniest month in Niederhart? 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.