Other facts from our historical weather data: Which months have the greatest rainfall in Hongyuan? Most rainfall (rainy season) is seen in June and September. Does Hongyuan have a dry season? Yes, the months of January and December are very dry. Which is the warmest month in Hongyuan? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Hongyuan? The coldest month is December with an average maximum temperature of -5°C (23°F). Which is the wettest month in Hongyuan? June tops the wettest month list with 167mm (6.6 in) of rainfall. Which is the driest month in Hongyuan? January is the driest month with 16mm (0.6 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.