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I have the same feeling that these are not very uncommon. My guess is, as I'm also from Sweden, is that the period of time the sun is in the right position for this is much longer at these latitudes.

I'm certain Iv'e seen clouds like these many times, at least 5 times if not more.

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> I have the same feeling that these are not very uncommon

The article explicitly states the rarity is at the given latitude:

“Such clouds are very rare at this latitude and also in winter…”

Naturally they chose to over-emphasize the rarity aspect in the headline, otherwise no-one would bother clicking.

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