Cappelen, John; Jensen, Jens. "GRØNLAND - Upernavik"(PDF). Climate Data for Selected Stations (1931-1960) (in Danish). Danish Meteorological Institute. p. 113. Archived from the original(PDF) on 27 April 2013. Retrieved 14 October 2019.
Cappelen, John; Jensen, Jens. "GRØNLAND - Upernavik"(PDF). Climate Data for Selected Stations (1931-1960) (in Danish). Danish Meteorological Institute. p. 113. Archived from the original(PDF) on 27 April 2013. Retrieved 14 October 2019.