day. While some historic buildings remain on the periphery of the central core, retail commercial activity is geographically focused on a small number of blocks around the pedestrianized streets and main square on the eastern side of the river, an area that was subject to a large-scale metamorphosis during the economically booming years in the 1960s in particular. During recent decades, a significant part of retail commercial activity has shifted to shopping malls and stores situated in the outskirts of the city. Meanwhile, the built-up areas have expanded greatly, and some suburbanization has taken place. Climate Uppsala lies immediately south of the 60th parallel north and has a humid continental climate (Dfb), with cold winters and warm summers. Due to its northerly location, Uppsala experiences over 18 hours of visible sunshine during the summer solstice, and under 6 hours of sunshine during the winter solstice. Despite Uppsala's northerly location, the winter is not as cold as other cities at similar latitudes, mainly due to the Gulf Stream. For example, in January Uppsala has a daily mean of −2.7 °C (27.1 °F). In Canada, at the same latitude, Fort Smith experiences a daily mean of −22.4 °C (−8.3 °F). With respect to record temperatures, the difference between the highest and lowest is relatively large. Uppsala’s highest recorded temperature was , recorded on 9 July 1933. On the same day Ultuna, which lies a few kilometres south of the centre of Uppsala, recorded a temperature of . This is the highest temperature ever recorded in the Scandinavian Peninsula, although the same temperature was recorded in Målilla, Sweden, 14 years later. Uppsala’s lowest temperature was recorded on 24 January 1875, when the temperature dropped to . The second-lowest temperature recorded is , which makes the record one of the hardest to beat, due to the fact that temperatures in Uppsala nowadays rarely goes below . The difference between the two records is . The warmest month ever recorded is July 2018, with a daily mean of 22.0 °C (70.5 °F). Since 2002 Uppsala has experienced 7 months where the daily mean was 20 °C (68 °F) or warmer, the most recent in July 2021 when the daily mean was 20.7 °C (68.9 °F). The coldest month ever recorded is January 1814, when the daily mean was −14.9 °C (5.2 °F). Between January 1814 and January 1987, Uppsala experienced 23 months that were colder