Other facts from our historical weather data: When is summer in Richfield?The hottest season / summer takes place in June, July, August and September. Does Richfield have a dry season? Yes, the months of January, February, April, June and November are very dry. Which is the warmest month in Richfield? July has an average maximum temperature of 32°C (90°F) and is the warmest month of the year. Which is the coldest month in Richfield? The coldest month is January with an average maximum temperature of 4°C (39°F). Which is the wettest month in Richfield? December tops the wettest month list with 26mm (1 in) of rainfall. Which is the driest month in Richfield? June is the driest month with 9mm (0.4 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.