Being located 145 kilometres north of the Arctic Circle, Kiruna has a Sub-Arctic climate with short, cool summers and long, cold winters, although the city itself can be considerably milder than the surrounding forest. Snowcover generally lasts from mid-October to mid-May, but snowfall can occur year-round. The sun doesn't set between May 30 and July 15, and perpetual daylight lasts from early May to early August. The period that the sun doesn't rise lasts from early December to early January, the exact boundaries depending on local topography. In this time of the year, a few hours of twilight are the only daylight available. During the midnight sun period, temperatures can rise as high as 25 degrees Celsius (77 F).