Serena is located in the Helsinki metropolitan region. The snow cover is highly variable in the area from year to year. On the average a permanent natural snow cover has arrived by Dec 31st, i.e. some years it comes later, but some years sooner. Resorts like Serena can use snow cannons to make their slopes usable sooner unless the weather is too adverse.
The best you can do is monitoring the Serena web cam http://www.serena.fi/en/ski/plan-your-visit/webcam/ and their web site before you arrive.
Thanks :-) I'll check out the camera.
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