Lake Omodeo and Lake Coghinas. The only natural freshwater lake is Lago di Baratz. A number of large, shallow, salt-water lagoons and pools are located along the coastline. Climate The climate of the island is variable from area to area, due to several factors including the extension in latitude and the elevation. It can be classified in two different macrobioclimates (Mediterranean pluviseasonal oceanic and Temperate oceanic), one macrobioclimatic variant (Submediterranean), and four classes of continentality (from weak semihyperoceanic to weak semicontinental), eight thermotypic horizons (from lower thermomediterranean to upper supratemperate), and seven ombrotypic horizons (from lower dry to lower hyperhumid), resulting in a combination of 43 different isobioclimates. During the year there is a major concentration of rainfall in the winter and autumn, some heavy showers in the spring and snowfalls in the highlands. The average temperature is between , with mild winters and warm summers on the coasts ( in January, in July), and cold winters and cool summers on the mountains ( in January, in July). Rainfall has a Mediterranean distribution all over the island, with almost totally rainless summers and wet autumns, winters and springs. However, in summer, the rare rainfalls can be characterized by short but severe thunderstorms, which can cause flash floods. The climate is also heavily influenced by the vicinity of the Gulf of Genoa (barometric low) and the relative proximity of the Atlantic Ocean. Low pressures in autumn can generate the formation of the so-called Medicanes, extratropical cyclones which affect the Mediterranean basin. In 2013, the island was hit by several cyclones, included the Cyclone Cleopatra, which dumped of rainfall within an hour and a half. Sardinia being relatively large and hilly, weather is not uniform; in particular the East is drier, but paradoxically it suffers the worst rainstorms: in autumn 2009, it rained more than in a single day in Siniscola, and 19 November 2013, locations in Sardinia were reported to have received more than within two hours. The western coast has a higher distribution of rainfalls even for modest elevations (for instance Iglesias, elevation , average annual precipitation ). The driest part of the island is the coast of Cagliari gulf, with less than per year, the minimum is at Capo Carbonara at the extreme south-east of the island , and the wettest is the top of the Gennargentu mountain with almost per year. The average for the entire island is