Other facts from our historical weather data: Which is the warmest month in Golden? 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 Golden? The coldest month is December with an average maximum temperature of -8°C (18°F). Which is the wettest month in Golden? June tops the wettest month list with 114mm (4.5 in) of rainfall. Which is the driest month in Golden? February is the driest month with 55mm (2.2 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.