rises to at la Croix Fleury, at the limits of Fleury-les-Aubrais. Conversely, the south (on the rive gauche) has a gentle depression to about above sea level (at Saint-Marceau) between the Loire and the Loiret, designated a "zone inondable" (flood-risk zone). At the end of the 1960s, the Orléans-la-Source neighbourhood was created, to the south of the original commune and separated from it by the Val d'Orléans and the river Loiret (whose source is in the Parc Floral de la Source). This quarter's altitude varies from about . Climate Orléans experiences an oceanic climate (Köppen climate classification Cfb), similar to much of central France. July, the warmest month, has an average temperature of and a high of , while January, the coldest month, has an average temperature of and an average low temperature of , although February has a lower average low than January at . The record high temperature is recorded in July, while the record low temperature of was recorded in January. Precipitation is evenly distributed year-round, with Orléans receiving of precipitation annually. However, some months are slightly wetter than others, with the driest month receiving of rain and the wettest receiving of precipitation on average. Precipitation days vary more, with less of them in the summer months than in the other seasons. Humidity is high year-round but decreases slightly in summer. July and August only have their humidity at 72% but December has 90% humidity on average. Orléans receives 1,767.3 hours of sunshine annually, with summer being the sunniest season and winter being the least sunny season. August, receiving 224.6 hours of sunshine on average, is the sunniest month, and December, receiving 56.6 hours of sunshine on average, has the least amount of sunshine. The Loire and navigation In Orléans, the Loire is separated by a submerged dike known as the dhuis into the Grande Loire to the north, no longer navigable, and the Petite Loire to the south. This dike is just one part of a vast system of construction that previously allowed the Loire to remain navigable to this point. The Loire was formerly an important navigation and trading route, and is at the heart of the city's foundation in the second century BC as a center of trade or emporium. More recently, during the 17th century, the river enabled Orleans to become a major hub for refining sugar, which was imported from the Caribbean