Other facts from our historical weather data: Which months have the greatest rainfall in Trepassey? Most rainfall (rainy season) is seen in January and December. Which is the warmest month in Trepassey? August has an average maximum temperature of 21°C (70°F) and is the warmest month of the year. Which is the coldest month in Trepassey? The coldest month is February with an average maximum temperature of 1°C (34°F). Which is the wettest month in Trepassey? January tops the wettest month list with 158mm (6.2 in) of rainfall. Which is the driest month in Trepassey? June is the driest month with 88mm (3.5 in) of precipitation. 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.