Upon your arrival from flights Norway, UK residents are greeted in Oslo to the same basic climate that they have at home, especially along the coast, due to the gulf stream. With about half the entire length of Norway being north of the arctic circle you wouldn’t expect that but summers in Norway can be moderately warm as high as 30°C, even in northern areas, but then only for limited periods of time.
The length and severity of the winter and amount of snow varies according to how far north and east you are on flights Norway. There is more snow and winters are dark and very long in the north. While on the on the southern and south western coast, winters are relatively moderate yet quite rainy. The further inland and easterly that you travel will see temperatures easily fall below -25°C in the heart of winter. There are numerous mountain areas that are inundated with permanent glaciers.
If you wait for darkness to signal your bedtime and or end of work day be aware that daylight varies greatly with the time of the year. In fact it is a constant rolling sunset and sunrise that can be quite unnerving to some visitors. For example, in Oslo, the sun sets at around 3:30 PM in December and at 10:43 PM on June 30th, the longest day of the year here. On these long days at midyear the lower latitudes summer nights exist only in the form of prolonged twilight during June and July. Referred to as “white nights”, they can be an unusual phenomenon for visitors.