Winds gusted to 100 km/h in Oslo, Norway. Gusts of more than 120 km/h were recorded elsewhere in the country.
Tens of thousands of households around the country were left without power for most of Christmas Day.
The winds also toppled thousands of trees, blocking roads and rail lines.
Offshore, 20-meter waves forced officials to cancel ferry service, stranding holiday travellers.
The storm pushed into Sweden and Finland later in the day. Gusts up to 90 km/h were recorded in Helsinki, and in Stockholm, winds were still sustained at 45 km/h and gusting to close to 70 km/h early Monday morning.
Stockholm police told local media they had received more than 60 calls for help, mostly regarding homes and vehicles damaged by falling trees.
With files from the Associated Press