Because of the gulf stream, the climate in Norway, especially along the coast, is noticeably warmer than what would otherwise be expected at such a high latitude. Almost half the length of Norway is north of the arctic circle. Summers can be moderately warm (up to 30°C), even in northern areas, but only for limited periods. The length of the winter and amount of snow varies. In the north there is more snow and winters are dark; on the southern and western coast, winters are moderate and rainy, while further inland the temperature can easily fall below -25°C. Even in the southeast, winter temperatures of -10ºC to -15ºC are common. Some mountain areas have permanent glaciers and patches of snow can be found in higher elevations even in the summer.
Norway's hours of daylight, temperature and driving conditions vary greatly throughout the year. Seasonal variations crucially depend on region as well as altitude. Note in particular that the area with midnight sun (north of the arctic circle) also has winter darkness (polar night) when the sun does not rise above the horizon at all.
Norwegian weather is most pleasant during the summer (June to mid-August). If you like snow, go to Norway in December to April. Along the coasts and in southern part of West Norway there is little snow or frost and few opportunities for skiing, even in winter. In the mountains there is snow until May and some mountain passes are closed until the end of May. If you come in the beginning of May some passes can be still closed, but since the snow is melting very quickly, you will get a possibility to enjoy plenty of waterfalls before they disappear. And in this time the number of tourists is very small. Spring in Norway is quite intense due to the abundance of water (melting snow) in conjunction with plenty of sunlight and quickly rising temperatures (typically in May).
Be aware that daylight varies greatly during the year. In Oslo, the sun sets at around 3:30 PM in December. North of the Arctic Circle one can experience the midnight sun and polar night (winter darkness). However, even at Oslo's latitude, summer nights exist only in the form of prolonged twilight during June and July, these gentle "white nights" can also be a nice and unusual experience for visitors. The polar (or northern) light (aurora borealis) occurs in the darker months, frequently at high latitudes (Northern Norway) but occasionally also further South.
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