Geography of Norway - Light, Timezone and Tide

Light, Timezone and Tide

Areas in Norway located north of the Arctic Circle will have midnight sun and corresponding winter darkness, the length of both depends on the latitude. In Longyearbyen, the upper part of the sun disc is above the horizon (provided clear view against the northern horizon) from April 19 to August 23, and the winter darkness lasts from October 27 - February 14. The corresponding dates for Tromsø are May 17 - July 25, and November 26 - January 15. The winter darkness is not totally dark on the mainland; there is twilight for a few hours around noon in Tromsø, but in Longyearbyen there is near total darkness in the midst of the dark period. Even the southern part of the country experiences large seasonal variations in daylight; in Oslo the sun rises at 03:54 and sets 22:54 at summer solstice, but is only above the horizon from 09:18 - 15:12 at winter solstice.

The northern part of the country is located in the aurora borealis zone; the aurora is occasionally seen in the southern part of the country.

Norway uses Central European Time, corresponding to the 15°E longitude. As the country is very elongated, this is at odds with the local daylight hours at the eastern and western parts. In Vardø the local daylight hours is 64 minutes earlier, and in Bergen it is 39 minutes later. Thus, Finnmark gains early morning daylight but loses evening daylight, and Vestlandet loses early morning light but gains more evening daylight with this timezone. Daylight saving time (GMT + 2) is observed from the last Sunday in March to the last Sunday in October.

The difference between low tide and high tide is small on the southern coast and large in the north; ranging from on average 0.17 m in Mandal to about 0.30 m in Oslo and Stavanger, 0.90 m in Bergen, 1.80 m in Trondheim, Bodø and Hammerfest and as much as 2.17 m in Vadsø.