councils, which carry responsibility for primary schools, social, leisure and cultural services within their respective areas. The municipality is usually described in terms of its three main parts: Innerstaden (Stockholm City Centre), Söderort (Southern Stockholm) and Västerort (Western Stockholm). The districts of these parts are: Stockholm City Centre Gamla stan Kungsholmen Norrmalm Södermalm Vasastan Östermalm Söderort Enskede-Årsta-Vantör Farsta Hägersten-Liljeholmen Skarpnäck Skärholmen Älvsjö Västerort Bromma Hässelby-Vällingby Rinkeby-Kista Spånga-Tensta The modern centre Norrmalm (concentrated around the town square Sergels torg) is the largest shopping district in Sweden. It is the most central part of Stockholm in business and shopping. Climate Stockholm has a humid continental climate in the 0 °C isotherm (Köppen: Dfb) and an oceanic climate (Cfb) in the -3 °C isotherm. Although winters are cold, average temperatures generally remain above 0 °C for much of the year. Summers are pleasantly warm, and precipitation occurs throughout the year. Due to the city's high northerly latitude, the length of the day varies widely from more than 18 hours around midsummer to only around 6 hours in late December. The nights from late May until mid-July are bright even when cloudy. Stockholm has relatively mild weather compared to other locations at a similar latitude, or even farther south. With an average of 1900 hours of sunshine per year, it is also one of the sunniest cities in Northern Europe, receiving more sunshine than Paris, London and a few other major European cities of a more southerly latitude. Because of the urban heat island effect and the prevailing wind travelling overland rather than sea during summer months, Stockholm has the warmest July months of the Nordic capitals. Stockholm has an annual average snow cover between 75 and 100 days. In spite of its mild climate, Stockholm is located further north than parts of Canada that are above the Arctic tree line at sea level. Summers average daytime high temperatures of and lows of around , but temperatures can reach on some days. Days above occur on average 1.55 days per year (1992–2011). Days between and are relatively common especially in July and August. Night-time lows of above are rare, and hot summer nights vary from . Winters generally bring cloudy weather with the most precipitation falling in December and January (as either rain or snow). The average winter temperatures range from , and occasionally drop below in the outskirts of the city. Spring and