Other facts from our historical weather data: Which is the warmest month in Llanvair Waterdine? 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 Llanvair Waterdine? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Llanvair Waterdine? December tops the wettest month list with 87mm (3.4 in) of rainfall. Which is the driest month in Llanvair Waterdine? September is the driest month with 68mm (2.7 in) of precipitation. Which is the sunniest month in Llanvair Waterdine? May is the sunniest month with an average of 169 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.