Other facts from our historical weather data: Which is the warmest month in Stiffkey? August has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Stiffkey? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Stiffkey? October tops the wettest month list with 87mm (3.4 in) of rainfall. Which is the driest month in Stiffkey? April is the driest month with 51mm (2 in) of precipitation. Which is the sunniest month in Stiffkey? July is the sunniest month with an average of 213 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.