The entire west coast of Greenland was ice-free in the 11th and 12th centuries. Vikings were growing row crops and raising livestock outdoors along the fjords there. The high arctic was so ice-free that walrus hunters could venture north in search of valuta as late as October.
It is well documented in the Icelandic sagas. (Translated from the original runes by Hermione Granger.)
What? There really is a Hermione Granger? Wouldn’t she be Weasley by now?
“It is well documented in the Icelandic sagas. (Translated from the original runes by Hermione Granger.)”
I love her work!