Hm. I haven't heard about that definition. And it wouldn't make much sense in a country like Norway. In the south and west, perhaps - but definitely not in the eastern inland regions and in the north. (In Tromsø, the largest town in the north of Norway, they use to say "we have ten months of winter and two months with bad conditions for skiing". Although an exaggeration, I'd still say they have winter from October to April)
Oh, and good morning Perun. Did you have any sleep?