(10), are mostly used for petrochemical industry. Together, these cities form the Rijnmond conurbation, centred on the city of Rotterdam. Together with Haaglanden (centred on The Hague) and Delfland (centred on Delft) in the north, and the Drechtsteden to the south-east, this conurbation in turn forms the South Wing of the Randstad conurbation, which spans across South Holland, North Holland and Utrecht. Other regions in South Holland include Alblasserwaard, Gouwestreek ("The Gouwe Area"), Hoeksche Waard, Krimpenerwaard, Rijnland ("Rhineland"), Rijnstreek ("The Rhine Area"), Vijfheerenlanden and Westland (roughly including Hook of Holland and the municipalities of Westland and Midden-Delfland). Climate Like the rest of the Netherlands, South Holland experiences a temperate oceanic climate, a Cfb-class according to the Köppen climate classification. The climate is influenced by the North Sea and the Atlantic Ocean, which results in relatively cooler summers and milder winters. Rain showers are common in the fall and winter seasons. Because of the flat surface, wind storms are also not uncommon in the winter. Although rain occurs all year long, the first six months of the year are relatively dry. Eastern winds can result in temporary continental climate conditions with relatively warm and dry summers and cold and stormy winters. The temperature varies between the 2 °C and 6 °C in the winter and 17 °C and 20 °C in the summer. Municipalities South Holland is divided into 50 municipalities. Leiden & Bollenstreek COROP group Hillegom Kaag en Braassem Katwijk Leiden Leiderdorp Lisse Noordwijk Oegstgeest Teylingen Voorschoten Zoeterwoude The Hague COROP group The Hague Leidschendam-Voorburg Pijnacker-Nootdorp Rijswijk Wassenaar Zoetermeer Delft & Westland COROP group Delft Midden-Delfland Westland East South Holland COROP group Alphen aan den Rijn Bodegraven-Reeuwijk Gouda Krimpenerwaard Nieuwkoop Waddinxveen Rijnmond COROP group Albrandswaard Barendrecht Capelle aan den IJssel Goeree-Overflakkee Hoeksche Waard Krimpen aan den IJssel Lansingerland Maassluis Nissewaard Ridderkerk Rotterdam Schiedam Vlaardingen Voorne aan Zee Zuidplas South East South Holland COROP group Alblasserdam Dordrecht Gorinchem Hardinxveld-Giessendam Hendrik-Ido-Ambacht Molenlanden Papendrecht Sliedrecht Zwijndrecht Economy The Gross domestic product (GDP) of the region was 163.8 billion € in 2018. This contributes to the gross domestic product of the Netherlands by 21.2%. GDP per capita adjusted for purchasing power was 38,700 € or 128% of the EU27 average in the same year. South Holland's labour force amounts to 1,661,000 people; 47.1% of the total population. The unemployment rate is 6.1% in 2013. The main sectors of economical activity in this province are