Other facts from our historical weather data: Which months have the greatest rainfall in Winster? Most rainfall (rainy season) is seen in October, November and December. Which is the warmest month in Winster? July has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in Winster? The coldest month is February with an average maximum temperature of 7°C (45°F). Which is the wettest month in Winster? December tops the wettest month list with 162mm (6.4 in) of rainfall. Which is the driest month in Winster? April is the driest month with 89mm (3.5 in) of precipitation. Which is the sunniest month in Winster? May is the sunniest month with an average of 217 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.