Other facts from our historical weather data: Which is the warmest month in Norham? 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 Norham? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Norham? November tops the wettest month list with 85mm (3.3 in) of rainfall. Which is the driest month in Norham? March is the driest month with 59mm (2.3 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.