Other facts from our historical weather data: Which is the warmest month in Valldal? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Valldal? The coldest month is December with an average maximum temperature of -1°C (30°F). Which is the wettest month in Valldal? January tops the wettest month list with 174mm (6.9 in) of rainfall. Which is the driest month in Valldal? May is the driest month with 105mm (4.1 in) of precipitation. Which is the sunniest month in Valldal? May is the sunniest month with an average of 180 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.