Because of its northerly latitude, Scotland in particular experiences big differences in seasonal sunrise and sunset hours. At the height of summer it might not get dark until 22:00, and in the depths of winter the darkness may set in as early as 15:00.

The long daylight hours in Scotland during the summer are a direct result of its high northern latitude. Situated between 55° and 61° North, Scotland is closer to the North Pole than much of the continental United States. During the summer solstice in June, the tilt of the Earth towards the sun means that northern regions receive nearly continuous light. In Edinburgh, the sun can stay up for over 17 hours, while in the Shetland Islands in the far north, it barely gets dark at all—a phenomenon locals call the "simmer dim." This extended twilight means you can often read a book outdoors at 11:00 PM. While this is spectacular for tourists wanting to explore the Highlands, it comes with a trade-off: in the depths of winter, the days are equally short, with the sun rising after 8:30 AM and setting before 3:45 PM, leaving the country in darkness for much of the day.