Other facts from our historical weather data: When is winter in Heggjafrislia? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Heggjafrislia? 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 Heggjafrislia? The coldest month is February with an average maximum temperature of 1°C (34°F). Which is the wettest month in Heggjafrislia? December tops the wettest month list with 229mm (9 in) of rainfall. Which is the driest month in Heggjafrislia? May is the driest month with 121mm (4.8 in) of precipitation. Which is the sunniest month in Heggjafrislia? 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.