Troms is located in the northern part of the
Scandinavian Peninsula. Due to the long distance to the more densely populated areas of the continent, this is one of the least
polluted areas of Europe. Troms has a very rugged and indented coastline facing the
Norwegian Sea. The large and mountainous
islands along the coast provide an excellent sheltered
waterway on the inside. Starting in the south, the largest islands are: northeastern part of
Hinnøya (the southern part is in Nordland),
Grytøya,
Senja,
Kvaløya,
Ringvassøya,
Reinøy,
Vanna, and
Arnøy. Some of these islands, most noteworthy Senja, have a rugged outer coast with steep mountains, and a more calm eastern shore. There are several large
fjords that stretch quite far inland. Starting in the south, the largest fjords are
Vågsfjorden,
Andfjorden (partially in
Nordland county),
Malangen,
Balsfjorden,
Ullsfjorden,
Lyngen, and
Kvænangen. The largest lake is
Altevatnet, in the interior of the county. reaching more than 1,800 m / high from
Balsfjord Municipality. There are mountains in all parts of Troms. The most alpine and striking are probably the
Lyngen Alps (
Lyngsalpene), with several small
glaciers and the highest mountain in the county,
Jiekkevarre with a height of . Several glaciers are located in
Kvænangen Municipality, including parts of the
Øksfjordjøkelen, the last glacier in mainland Norway to drop icebergs directly into the sea, in the
Jøkelfjord. The largest river in Troms by waterflow is
Målselva, in
Målselv Municipality. The largest waterfall, not the highest, is
Målselvfossen at long and high. Marble is present in parts of Troms, and in numerous
caves, in
Salangen Municipality and
Tjeldsund Municipality.
Climate Located at a latitude of nearly 70°N, Troms has short, cool summers, but fairly mild winters along the coast due to the temperate sea.
Torsvåg Lighthouse in
Karlsøy Municipality has a January 24-hr average of . Tromsø averages in January with a daily high of . July averages with a high of . Temperatures are typically below freezing for about 5 months (8 months in the mountains), from early November to the beginning of April. Coastal areas are moderated by the sea. With more than 130 years of official weather recordings, the coldest winter temperature ever recorded in Tromsø is in February 1985. The all-time high for Troms is recorded in
Bardufoss 18 July 2018. Thaws can occur even in mid-winter. There is often snow in abundance, and
avalanches were not uncommon in winter. With the prevailing westerlies, lowland areas east of mountain ranges have less precipitation than areas west of the mountains.
Skibotn (elevation: ) in
Storfjord Municipality is the location in Norway which has recorded the most days per year with no clouds. Winter temperatures in
Målselv Municipality and
Bardu Municipality can get down to . Summer days can reach in inland valleys and the innermost fjord areas, but is much more common. Along the outer seaboard, a summer day at is considered fairly warm.
Sunlight The
aurora borealis is a common sight in the whole of Troms, but not in summer as there is no darkness. As with all areas in the polar latitudes, there are extreme variations in daylight between the seasons. As a consequence of this, the length of daylight increases in late winter and spring. It decreases in autumn by 10 minutes from one day to the next. ==Nature==