Other facts from our historical weather data: Which is the warmest month in Longyearbyen? July has an average maximum temperature of 8°C (46°F) and is the warmest month of the year. Which is the coldest month in Longyearbyen? The coldest month is March with an average maximum temperature of -11°C (12°F). Which is the wettest month in Longyearbyen? November tops the wettest month list with 59mm (2.3 in) of rainfall. Which is the driest month in Longyearbyen? June is the driest month with 28mm (1.1 in) of precipitation. Which is the sunniest month in Longyearbyen? May is the sunniest month with an average of 256 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.