If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Fjaerland: The hottest months are usually July and August, with an average temperature of 12°C, while the coldest months are January and December, with an average of -5°C. The rainiest months in Fjaerland are December, October, September and January, with each month seeing an average of 238 mm of rainfall.