I've been planning a flight to Trondheim (ENVA) for quite a while (can do this in one leg in the TB20, from the S. Coast) but almost every time I look at the MSLP chart, the whole place is so buried under fronts one can hardly see Norway!
I reckon it's a place where flying is totally wonderful when the weather is CAVOK, and absolutely sh*te, even for IFR, the rest of the time. Airline pilots I have spoken to report regular serious icing conditions.
One needs to pick the (very) few really clear days, IMHO.