Other facts from our historical weather data: Which is the warmest month in Gibbston? January has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Gibbston? The coldest month is July with an average maximum temperature of 3°C (37°F). Which is the wettest month in Gibbston? December tops the wettest month list with 130mm (5.1 in) of rainfall. Which is the driest month in Gibbston? July is the driest month with 86mm (3.4 in) of precipitation. Which is the sunniest month in Gibbston? January is the sunniest month with an average of 230 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.