Summers usually bring plenty of sunshine and the average high temperature of . Nights can be quite cool even in summer, though. Precipitation in Prague is rather low (just over per year) since it is located in the rain shadow of the Sudetes and other mountain ranges. The driest season is usually winter while late spring and summer can bring quite heavy rain, especially in form of thundershowers. Temperature inversions are relatively common between mid-October and mid-March bringing foggy, cold days and sometimes moderate air pollution. Prague is also a windy city with common sustained western winds and an average wind speed of that often help break temperature inversions and clear the air in cold months. Administration Administrative division Prague is the capital of the Czech Republic and as such is the regular seat of its central authorities. Since 24 November 1990, it is de facto again a statutory city, but has a specific status of the municipality and the region at the same time. Prague also houses the administrative institutions of the Central Bohemian Region. Until 1949, all administrative districts of Prague were formed by the whole one or more cadastral unit, municipality or town. Since 1949, there has been a fundamental change in the administrative division. Since then, the boundaries of many urban districts, administrative districts and city districts are independent of the boundaries of cadastral territories and some cadastral territories are thus divided into administrative and self-governing parts of the city. Cadastral area (for example, Vinohrady, Smíchov) are still relevant especially for the registration of land and real estate and house numbering. Prague is divided into 10 municipal districts (1–10), 22 administrative districts (1–22), 57 municipal parts, and 112 cadastral areas. City government Prague is autonomously administered by the Prague City Assembly, which is elected through municipal elections and consists of 65 members. Executive body of Prague, elected by the Assembly is a Prague City Council. The municipal office of Prague is called Prague City Hall. It has 11 members including the mayor and it prepares proposals for the Assembly meetings and ensures that adopted resolutions are fulfilled. The Mayor of Prague is Civic Democratic Party member Bohuslav Svoboda. Demographics 2011 census Even though the official population of Prague hovers around 1.3 million as of the 2011 census, the city's real population is much higher due to only 65% of its residents being marked as permanently living