http://sharki.oslo.dnmi.no/portal/page?_pageid=73,39035,73_39049&_dad=portal&_schema=PORTAL Norwegian Meteorological Institute's eklima site] In an average winter, Tromsø sees 160 days with at least 25 cms of snow on the ground (based on 1970–2000 average and recorded at the meteorological office station on top of the island, 100 meters above sea level).