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Where are how are you changing it, exactly? Yoda's link is just telling you what value to use in province.csv, "5" would be the right one I would have thought.
well... winter isn't 365 days/year
you have winter settings in a period of 1-4 months between october/november and february/march.
it also depends on how much you are northern and don't forget that not every year you'll have snow