Other facts from our historical weather data: Which is the warmest month in North Charlton? July has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in North Charlton? The coldest month is January with an average maximum temperature of 8°C (46°F). Which is the wettest month in North Charlton? November tops the wettest month list with 82mm (3.2 in) of rainfall. Which is the driest month in North Charlton? March is the driest month with 56mm (2.2 in) of precipitation. Which is the sunniest month in North Charlton? May is the sunniest month with an average of 183 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.