Other facts from our historical weather data: When is winter in Terrace? The coldest season / winter is in the following months: January, February, November and December. Which is the warmest month in Terrace? July has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Terrace? The coldest month is January with an average maximum temperature of -1°C (30°F). Which is the wettest month in Terrace? November tops the wettest month list with 285mm (11.2 in) of rainfall. Which is the driest month in Terrace? May is the driest month with 106mm (4.2 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.