11C and very sunny at 9AM. We use open windows and the ocean breeze to help cool down our house in Summer. We have a great many windows that face the sun throughout the day in Winter, and that sort of free solar heat helps to cut down on the heating bill in the daytime.20 degrees at 9 pm - a bit damp but generally nice time of year but moving to chillier nights as no heating and a house wide open to airflow by design.
I like the Iceland solution with separate duvets. ( doonas in 'Stralian )
Sleeping with another person can be hard. Make it a little easier with Scandinavia's own peace treaty for the bedroom: the two duvet system.www.scandinaviastandard.com
Some discussion about it pre chilly season. 13 is very rare so mid teens the norm. We've only just turned the over head fan off.