I have to totally disagree with that...
Winter, the sun is very low and has a very special smooth quality throughout the day. Sunset colors will come slowly and will last for much longer than the 10mn before and after sunset. Of course if it is overcast, then it's almost like night time. Nice clouds too, especially in spring.
As for summer, I found it to be not the best time as there's so much light! Of course night does not really come and you have (at Oslo latitude) a dusk type of light from 23:00 to 03:00. Skies in summer are often clear, cloudless.
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