Other facts from our historical weather data: Which is the warmest month in Roscrea? 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 Roscrea? The coldest month is February with an average maximum temperature of 9°C (48°F). Which is the wettest month in Roscrea? December tops the wettest month list with 92mm (3.6 in) of rainfall. Which is the driest month in Roscrea? March is the driest month with 73mm (2.9 in) of precipitation. Which is the sunniest month in Roscrea? May is the sunniest month with an average of 182 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.