going through careful redevelopment, preparing to become one of the major cities of the Euro-Mediterranean area. Roman Catholicism is highly important in Palermitan culture. The Patron Saint of Palermo is Santa Rosalia whose Feast Day is celebrated on 15 July. The area attracts significant numbers of tourists each year and is widely known for its colourful fruit, vegetable and fish markets at the heart of Palermo, known as Vucciria, Ballarò and Capo. Geography Palermo lies in a basin, formed by the Papireto, Kemonia and Oreto rivers. The basin was named the Conca d'Oro (the Golden Basin) by the Arabs in the 9th century. The city is surrounded by a mountain range which is named after the city itself. These mountains face the Tyrrhenian Sea. Palermo is home to a natural port and offers excellent views to the sea, especially from Monte Pellegrino. Climate Palermo experiences a hot-summer subtropical Mediterranean climate (Köppen climate classification: Csa) with moderate seasonality. Summers are very long, hot and dry due to the domination of subtropical high pressure system, while winters are mild and changeable, with rainy weather due to the polar front. Temperatures in autumn and spring are typically warm. Palermo is one of the warmest cities in Europe (mainly due to its warm nights), with an average annual air temperature of ; it is one of the warmest cities in Italy. It receives approximately 2,530 hours of sunshine per year. Snow is a rare occurrence having snowed about a dozen times since 1945. Since the 1940s to nowadays there have been at least five times when considerable snowfall has occurred. In 1949 and in 1956, when the minimum temperature went down to , the city was blanketed by some centimetres of snow. Snowfalls also occurred in 1981, 1986, 1999 and 2014. The average annual temperature of the sea is above ; from in February to in August. In the period from November to May, the average sea temperature exceeds and in the period from June to October, the average sea temperature exceeds . Topography Palermo is surrounded by mountains, which form a cirque around the city. Some districts of the city are divided by the mountains themselves. Historically, it was relatively difficult to reach the inner part of Sicily from the city because of the mounts. The tallest peak of the range is La Pizzuta, about high. However, historically, the most important mount is