Other facts from our historical weather data: Which is the warmest month in Chathill? 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 Chathill? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Chathill? November tops the wettest month list with 86mm (3.4 in) of rainfall. Which is the driest month in Chathill? May is the driest month with 55mm (2.2 in) of precipitation. Which is the sunniest month in Chathill? 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.