Other facts from our historical weather data: Which months have the greatest rainfall in Trevor? Most rainfall (rainy season) is seen in January, February, October, November and December. Which is the warmest month in Trevor? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Trevor? The coldest month is February with an average maximum temperature of 9°C (48°F). Which is the wettest month in Trevor? November tops the wettest month list with 203mm (8 in) of rainfall. Which is the driest month in Trevor? May is the driest month with 93mm (3.7 in) of precipitation. Which is the sunniest month in Trevor? 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.