Other facts from our historical weather data: Which months have the greatest rainfall in Luster? Most rainfall (rainy season) is seen in January and December. Which is the warmest month in Luster? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Luster? The coldest month is December with an average maximum temperature of -3°C (27°F). Which is the wettest month in Luster? December tops the wettest month list with 166mm (6.5 in) of rainfall. Which is the driest month in Luster? May is the driest month with 90mm (3.5 in) of precipitation. Which is the sunniest month in Luster? May is the sunniest month with an average of 180 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.