It's hard to believe that rain could ever occur in regions experiencing polar night, but this is what happened on Friday and Saturday at most locations along the Arctic coast of Alaska. Rain with temperatures above freezing was reported from Cape Lisburne to Barter Island, including at Point Lay, Wainwright, Atqasuk, Nuiqsut, and Deadhorse. Apparently only Barrow managed to remain all snow.
Is this unprecedented? It would seem not; Barrow has had at least a few freezing rain or plain rain events in the depths of winter. The most notable appears to have been January 27-29, 1963, when precipitation on the three days was 0.03", 0.03", and 0.16", with only a trace of snow. High temperatures were 29, 34, and 35 °F respectively, and balloon soundings suggest that temperatures were continuously above freezing aloft for more than 60 hours.
So where did all the cold air go? Down into the lower 48. Yesterday's high temperature was higher at Deadhorse (39 °F) than in Corpus Christi, TX (38 °F); so we can say that it was just as warm on the Arctic coast as on the coast of the Gulf of Mexico. The two surface observation charts below illustrate the situation at about 8 pm AKST last night (red numbers are temperature reports):