Other facts from our historical weather data: Which is the warmest month in Millers Dale? 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 Millers Dale? The coldest month is February with an average maximum temperature of 7°C (45°F). Which is the wettest month in Millers Dale? June tops the wettest month list with 101mm (4 in) of rainfall. Which is the driest month in Millers Dale? March is the driest month with 77mm (3 in) of precipitation. Which is the sunniest month in Millers Dale? May is the sunniest month with an average of 199 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.